Holley (HLLY) 10-Q 10 Nov 21 2021 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 26, 2021	Nov. 09, 2021
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 26, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Registrant Name	HOLLEY INC.
Entity Central Index Key	0001822928
Entity Incorporation, State or Country Code	DE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Shell Company	false
Entity Ex Transition Period	false
Entity Tax Identification Number	87-1727560
Entity File Number	001-39599
Entity Address, Address Line One	1801 Russellville Road
Entity Address, City or Town	Bowling Green
Entity Address, State or Province	KY
Entity Address, Postal Zip Code	42101
City Area Code	270
Local Phone Number	495-4081
Entity Common Stock, Shares Outstanding		115,805,639
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.0001
Trading Symbol	HLLY
Security Exchange Name	NYSE
Warrant
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase common stock
Trading Symbol	HLLY WS
Security Exchange Name	NYSE

Condensed Balance Sheets

Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 53,927	$ 71,674
Accounts receivable, less allowance for credit losses of $1,616 and $1,240, respectively	55,359	47,341
Inventory	164,343	133,928
Prepaids and other current assets	8,934	5,037
Total Current Assets	282,563	257,980
Property, plant, and equipment, net	50,393	43,729
Goodwill	381,860	359,099
Other intangibles assets, net	421,870	404,522
Total Assets	1,136,686	1,065,330
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	46,631	34,601
Accrued interest	6,277	6,588
Accrued liabilities	18,768	26,092
Acquisition contingent consideration payable	24,373	9,200
Current portion of long-term debt	5,528	5,528
Total current liabilities	101,577	82,009
Long-term debt, net of current portion	564,187	649,458
Long-term debt due to related party	6,207	20,000
Warrant liability	45,986
Earn-out liability	24,588
Deferred taxes	72,172	71,336
Other noncurrent liabilities	2,146	2,146
Total Liabilities	816,863	824,949
Commitments and contingencies (Refer to Note 16 - Commitments and Contingencies)
Shareholders' Equity
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, none issued and outstanding as of September 26, 2021 and December 31, 2020
Common stock, $0.0001 par value, 550,000,000 shares authorized, 115,805,639 and 67,673,884 shares issued and outstanding as of September 26, 2021 and December 31, 2020, respectively	12	7
Additional paid-in capital	327,490	238,883
Accumulated other comprehensive loss	(686)	(674)
Retained earnings	6,993	2,165
Total stockholders' equity	319,823	240,381
Total liabilities and stockholders' equity	$ 1,136,686	$ 1,065,330

Condensed Balance Sheets (Paren

Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Accounts receivable, allowance for doubtful accounts	$ 1,616	$ 1,240
Preference shares, par value (in Dollars per share)	$ 0.0001	$ 0.0001
Preference shares, authorized	5,000,000	5,000,000
Preference shares, issued	0	0
Preference shares, outstanding	0	0
Ordinary shares, par value (in Dollars per share)	$ 0.0001	$ 0.0001
Ordinary shares, authorized	550,000,000	550,000,000
Common stock, share issued	115,805,639	67,673,884
Common Stock, Shares, Outstanding	115,805,639	67,673,884

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Net sales	$ 159,673	$ 133,307	$ 513,046	$ 365,760
Cost of goods sold	94,475	77,778	300,969	212,070
Gross profit	65,198	55,529	212,077	153,690
Selling, general, and administrative	28,891	17,303	79,093	48,790
Research and development costs	7,133	5,982	20,167	17,198
Amortization of intangible assets	3,553	2,699	10,391	8,099
Acquisition and restructuring costs	368	1,092	21,877	5,624
Related party acquisition and management fee costs	23,250	894	25,789	2,665
Other operating expense (income)	89	(821)	3	(1,089)
Total operating expense	63,284	27,149	157,320	81,287
Operating income	1,914	28,380	54,757	72,403
Change in fair value of warrant liability	17,273		17,273
Change in fair value of earn-out liability	6,866		6,866
Loss on early extinguishment of debt	1,425		1,425
Interest expense	9,851	9,325	31,096	31,843
Total non-operating expense	35,415	9,325	56,660	31,843
Income (loss) before income taxes	(33,501)	19,055	(1,903)	40,560
Income tax expense	(3,301)	5,512	7,255	9,656
Net income (loss)	(30,200)	13,543	(9,158)	30,904
Comprehensive income (loss)
Foreign currency translation adjustment	(31)		(12)
Total comprehensive income (loss)	$ (30,231)	$ 13,543	$ (9,170)	$ 30,904
Weighted average common shares assuming dilution	106,285,072	67,673,884	80,735,661	67,673,884
Basic net income (loss) per share	$ (0.28)	$ 0.20	$ (0.11)	$ 0.46
Diluted net income (loss) per share	$ (0.28)	$ 0.20	$ (0.11)	$ 0.46

Condensed Statements of Changes

Condensed Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Retroactive application of recapitalization	Previously Reported [Member]	Common Stock	Common StockRetroactive application of recapitalization	Common StockPreviously Reported [Member]	Additional Paid-in Capital	Additional Paid-in CapitalRetroactive application of recapitalization	Additional Paid-in CapitalPreviously Reported [Member]	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive LossRetroactive application of recapitalization	Accumulated Other Comprehensive LossPreviously Reported [Member]	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit)Retroactive application of recapitalization	Retained Earnings (Accumulated Deficit)Previously Reported [Member]
Balance at beginning at Dec. 31, 2019	$ 205,414		$ 205,414	$ 7	$ 7		$ 236,496	$ (7)	$ 236,503	$ (397)		$ (397)	$ (30,692)		$ (30,692)
Balance at beginning (in Shares) at Dec. 31, 2019				67,673,884	67,673,784	100
Net income (loss)	4,852												4,852
Equity compensation	121						121
Balance, at ending at Mar. 29, 2020	210,387			$ 7			236,617			(397)			(25,840)
Balance, at ending (in Shares) at Mar. 29, 2020				67,673,884
Balance at beginning at Dec. 31, 2019	205,414		$ 205,414	$ 7	$ 7		236,496	$ (7)	$ 236,503	(397)		$ (397)	(30,692)		$ (30,692)
Balance at beginning (in Shares) at Dec. 31, 2019				67,673,884	67,673,784	100
Net income (loss)	30,904
Capital distributions	(100)
Foreign currency translation
Balance, at ending at Sep. 27, 2020	236,574			$ 7			236,752			(397)			212
Balance, at ending (in Shares) at Sep. 27, 2020				67,673,884
Balance at beginning at Mar. 29, 2020	210,387			$ 7			236,617			(397)			(25,840)
Balance at beginning (in Shares) at Mar. 29, 2020				67,673,884
Net income (loss)	12,509												12,509
Equity compensation	114						114
Capital distributions	(100)						(100)
Balance, at ending at Jun. 28, 2020	222,910			$ 7			236,631			(397)			(13,331)
Balance, at ending (in Shares) at Jun. 28, 2020				67,673,884
Net income (loss)	13,543												13,543
Equity compensation	121						121
Foreign currency translation
Balance, at ending at Sep. 27, 2020	236,574			$ 7			236,752			(397)			212
Balance, at ending (in Shares) at Sep. 27, 2020				67,673,884
Balance at beginning at Dec. 31, 2020	240,381			$ 7			238,883			(674)			2,165
Balance at beginning (in Shares) at Dec. 31, 2020				67,673,884
Net income (loss)	(2,056)												(2,056)
Equity compensation	131						131
Foreign currency translation	(16)									(16)
Balance, at ending at Mar. 28, 2021	238,440			$ 7			239,014			(690)			109
Balance, at ending (in Shares) at Mar. 28, 2021				67,673,884
Balance at beginning at Dec. 31, 2020	240,381			$ 7			238,883			(674)			2,165
Balance at beginning (in Shares) at Dec. 31, 2020				67,673,884
Net income (loss)	(9,158)
Capital distributions
Foreign currency translation	(12)
Balance, at ending at Sep. 26, 2021	319,823			$ 12			327,490			(686)			6,993
Balance, at ending (in Shares) at Sep. 26, 2021				115,805,639
Balance at beginning at Mar. 28, 2021	238,440			$ 7			239,014			(690)			109
Balance at beginning (in Shares) at Mar. 28, 2021				67,673,884
Net income (loss)	23,098												23,098
Equity compensation	131						131
Foreign currency translation	35									35
Balance, at ending at Jun. 27, 2021	261,704			$ 7			239,145			(655)			23,207
Balance, at ending (in Shares) at Jun. 27, 2021				67,673,884
Net income (loss)	(30,200)												(30,200)
Equity compensation	2,486						2,486
Foreign currency translation	(31)									(31)
Recapitalization transaction, net	85,864			$ 5			85,859
Recapitalization transaction, net (in Shares)				48,131,755
Balance, at ending at Sep. 26, 2021	$ 319,823			$ 12			$ 327,490			$ (686)			$ 6,993
Balance, at ending (in Shares) at Sep. 26, 2021				115,805,639

Condensed Statement of Cash Flo

Condensed Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020
OPERATING ACTIVITIES
Net income (loss)	$ (9,158)	$ 30,904
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	7,328	6,039
Amortization of intangible assets	10,391	8,099
Amortization of deferred loan costs	2,656	2,201
Increase in warrant liability	17,273
Increase in acquisition contingent consideration payable	17,173
Increase in earn-out liability	6,866
Equity compensation	2,748	356
Change in deferred taxes	(836)	583
Loss on early extinguishment of long-term debt	1,425
Loss (gain) on disposal of property, plant and equipment	(290)	18
Allowance for credit losses	738	581
Changes in operating assets and liabilities:
Accounts receivable	(5,196)	(15,678)
Inventories	(25,996)	33,208
Prepaids and other current assets	(3,472)	2,494
Accounts payable	9,765	1,871
Accrued interest	(311)	(1,352)
Accrued liabilities	(7,859)	6,280
Net cash from operating activities	24,917	75,604
INVESTING ACTIVITIES.
Capital expenditures	(10,468)	(6,653)
Proceeds from the disposal of fixed assets	323
Cash paid for acquisitions, net	(61,786)
Trademark Acquisition		(50)
Net cash used in investing activities	(71,931)	(6,703)
FINANCING ACTIVITIES
Net change under revolving credit agreement		(20,500)
Principal payments on long-term debt	(103,032)	(1,900)
Proceeds from Business Combination and PIPE financing,net of issuance costs paid	132,299
Capital distributions		(100)
Net Cash Provided by (Used in) Financing Activities, Total	29,267	(22,500)
Net change in cash and cash equivalents	(17,747)	46,401
Cash and cash equivalents:
Beginning of period	71,674	8,335
End of period	53,927	54,736
Supplemental disclosures of cash flow information:
Cash paid for interest	28,751	30,995
Cash paid for income taxes	10,648	$ 1,865
Non-Cash Investing and Financing Activities:
Assumption of warrant liability	28,713
Assumption of earn-out liability	$ 17,722

DESCRIPTION OF ORGANIZATION AND

DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS	9 Months Ended
	Sep. 26, 2021
Accounting Policies [Abstract]
DESCRIPTION OF THE BUSINESS, BASIS OF PRESENTATION, AND SUMMARY ACCOUNTING POLICIES	1. Description of the Business, Basis of Presentation, and Summary of Significant Accounting Policies Holley Inc., a Delaware corporation headquartered in Bowling Green, Kentucky (the “Company” or “Holley”), conducts operations through its wholly-owned subsidiaries. These operating subsidiaries are comprised of Holley Performance Products Inc. (“Holley Performance”), Hot Rod Brands, Inc. (“Hot Rod Brands”), Simpson Safety Solutions, Inc., B&M Racing and Performance Products, Inc., and Speedshop.com, Inc. Investment funds managed by Sentinel Capital Partners hold a controlling interest in Holley. On July 16, 2021, (the “Closing” and such date, the “Closing Date”) the Company consummated the business combination (the “Business Combination”) pursuant to that certain Agreement and Plan of Merger dated March 11, 2021 (the “Merger Agreement”), by and among Empower Ltd., (“Empower”), Empower Merger Sub I Inc. (“Merger Sub I”), Empower Merger Sub II LLC (“Merger Sub II”), and Holley Intermediate Holdings, Inc. (“Holley Intermediate”). On the Closing Date, Empower changed its name to Holley Inc. See Note 2, “ Business Combination and Acquisitions,” for more information. Holley Intermediate, the predecessor to Holley, was incorporated on October 25, 2018 to effect the merger of Driven Performance Brands, Inc. (“Driven”) and the purchase of High Performance Industries, Inc. (“HPI”). The Company designs, manufactures and distributes performance automotive products to customers primarily in the United States, Canada and Europe. The Company is a leading manufacturer of a diversified line of performance automotive products, including carburetors, fuel pumps, fuel injection systems, nitrous oxide injection systems, superchargers, exhaust headers, mufflers, distributors, ignition components, engine tuners and automotive performance plumbing products that are produced through its two major subsidiaries, Holley Performance and Hot Rod Brands. The Company is also a leading manufacturer of exhaust products as well as shifters, converters, transmission kits, transmissions, tuners and automotive software. The Company’s products are designed to enhance street, off-road, recreational and competitive vehicle performance through increased horsepower, torque and drivability. The Company has locations in North America, Canada, Italy and China. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP" or “GAAP”) and applicable rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the Holley Intermediate Holdings, Inc. audited consolidated financial statements and notes thereto for the year ended December 31, 2020, as filed with the SEC in the Company’s prospectus filed pursuant to Rule 424(b)(3) on July 28, 2021. In management’s opinion, the unaudited interim condensed consolidated financial statements reflect all adjustments, which are of a normal and recurring nature, that are necessary for a fair presentation of financial results for the interim periods presented. Operating results for any quarter are not necessarily indicative of the results for the full fiscal year. The Company operates on a calendar year that ends on December 31, 2021 and 2020. The three and nine month periods ended September 26, 2021 and September 27, 2020 each included 13 weeks and 39 weeks, respectively. Principles of Consolidation These unaudited condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All significant intercompany transactions and accounts have been eliminated in consolidation. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Significant areas for which management uses estimates include: (1) warranties; (2) allowance for credit losses; (3) inventory reserves; (4) asset impairments, including goodwill, intangible assets and other long-lived assets; (5) customer co-operative advertising; (6) sales returns and allowances; (7) tax positions; (8) deferred tax liabilities; and (9) fair value measurements, including equity awards and warrant and earn-out liabilities. These estimates require the use of judgment as future events and the effect of these events cannot be predicted with certainty. The estimates will change as new events occur, as more experience is acquired and as more information is obtained. The Company evaluates and updates assumptions and estimates on an ongoing basis and may consult outside experts to assist as considered necessary. Emerging Growth Company Status Section 102(b)(1) of the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”), exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company is an emerging growth company, and, as such, has elected to take advantage of the benefits of the extended transition period for new or revised financial accounting standards. Risks and Uncertainties COVID-19 has adversely impacted global supply chain and general economic conditions. The Company has experienced disruptions and higher costs in manufacturing, supply chain, logistical operations, and shortages of certain Company products in distribution channels. The full extent of the impact of the COVID-19 pandemic on the Company's business and operational and financial performance and condition is currently uncertain and will depend on many factors outside the Company's control, including but not limited to the timing, extent, duration and effects of the virus and any of its mutations, the utilization and effectiveness of treatments and vaccines, the imposition of effective public safety and other protective measures, the further impact of COVID-19 on the global economy and demand for the Company's products and services. Should the COVID-19 pandemic, including variants such as Delta, not improve or worsen, or if the Company's attempt to mitigate its impact on its supply chain, operations and costs is not successful, the Company's business, results of operations, financial condition and prospects may be adversely affected. Summary of Significant Accounting Policies The following are updates to the significant accounting policies described in our audited consolidated financial statements as of and for the year ended December 31, 2020. Earnings per Share Earnings per share is computed by dividing net income or loss available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. The dilutive effect of these potential common shares is reflected in diluted earnings per share by application of the treasury stock method. Warrants The Company reviews the terms of warrants to purchase its common stock to determine whether warrants should be classified as liabilities or stockholders' equity in its consolidated balance sheet. In order for a warrant to be classified in stockholders' equity, the warrant must be (a) indexed to the Company's equity and (b) meet the conditions for equity classification in Accounting Standards Codification ("ASC") Subtopic 815-40, Derivatives and Hedging-Contracts in an Entity's Own Equity. If a warrant does not meet the conditions for equity classification, it is carried in the condensed consolidated balance sheet as a warrant liability measured at fair value, with subsequent changes in the fair value of the warrant recorded in the condensed consolidated statements of comprehensive income as a non-operating expense. If a warrant meets both conditions for equity classification, the warrant is initially recorded in additional paid-in capital on the consolidated balance sheet, and the amount initially recorded is not subsequently remeasured at fair value. Stock-Based Compensation The Company accounts for share-based awards granted to employees and nonemployees under the fair value method prescribed by ASC Subtopic 718-10, Stock Compensation. Stock-based compensation cost is measured based on the estimated grant date fair value of the award and is recognized as expense over the requisite service period. The fair value of stock options is estimated using the Black Scholes option-pricing model. The Company accounts for forfeitures as they occur. Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimizes the use of unobservable inputs to the extent possible. The inputs used to measure fair value are prioritized based on a three-level hierarchy, which are defined as follows: Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2 – Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3 – Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability. Derivative Financial Instruments The Company evaluates its financial instruments to determine if such instruments are derivatives or contain features that qualify as embedded derivatives in accordance with ASC Topic 815, “Derivatives and Hedging”. For derivative financial instruments that are accounted for as liabilities, the derivative instrument is initially recorded at its fair value on the grant date and is then re-valued at each reporting date, with changes in the fair value reported in the statements of operations. Derivative liabilities are classified on the balance sheet as current or non-current based on whether or not net-cash settlement or conversion of the instrument could be required within 12 months of the balance sheet date. Recent Accounting Pronouncements Accounting Standards Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The ASU is effective for the Company for annual reporting periods beginning after December 15, 2021 and interim periods therein, with early adoption permitted. The ASU will require lessees to report most leases as assets and liabilities on the balance sheet. The Company is currently evaluating the potential impact of adopting this guidance on its financial statements. In August 2018, the FASB issued ASU 2018-14, Compensation – Retirements Benefits – Defined Benefit Plans – General (Subtopic 715-20). The ASU is effective for the Company for annual reporting periods beginning after December 15, 2021 with early adoption permitted. This guidance should be applied on a retrospective basis to all periods presented. The ASU will update disclosure requirements for employers that sponsor defined benefit pension or other post retirement plans. The Company is currently evaluating the potential impact of adopting this guidance on its financial statements. In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (Topic 740) which is intended to simplify various aspects related to accounting for income taxes. This ASU is effective for the Company for annual reporting periods beginning after December 15, 2021 and interim periods therein, with early adoption permitted. The ASU removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The Company is currently evaluating the potential impact of adopting this guidance on its financial statements. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848). The ASU provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. Adoption of the provisions of ASU 2020-04 are optional and are effective from March 12, 2020 through December 31, 2022. As of September 26, 2021, the Company did not adopt any expedients or exceptions under ASU 2020-04. The Company will continue to evaluate the impact of ASU 2020-04 and whether it will apply the optional expedients and exceptions. In August 2020, the FASB issued ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (Subtopic 470-20). The ASU is effective for the Company for annual reporting periods beginning after December 15, 2023 and interim periods therein, with early adoption permitted as of the beginning of the Company's annual fiscal year. The ASU includes amendments to the guidance on convertible instruments and the derivative scope exception for contracts in an entity’s own equity and simplifies the accounting for convertible instruments which include beneficial conversion features or cash conversion features by removing certain separation models in Subtopic 470-20. Additionally, the ASU requires entities to use the “if-converted” method when calculating diluted earnings per share for convertible instruments. The Company is currently evaluating the potential impact of adopting this guidance on its financial statements.

INVENTORY

INVENTORY	9 Months Ended
	Sep. 26, 2021
Inventory Disclosure [Abstract]
Inventory	3. INVENTORY Inventories of the Company consisted of the following: September 26, December 31, 2021 2020 Raw materials $ 48,665 $ 44,474 Work-in-process 18,960 12,946 Finished goods 96,718 76,508 $ 164,343 $ 133,928

PROPERTY, PLANT AND EQUIPMENT,

PROPERTY, PLANT AND EQUIPMENT, NET	9 Months Ended
	Sep. 26, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure	4. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment of the Company consisted of the following: September 26, December 31, 2021 2020 Land $ 1,330 $ 1,330 Buildings and improvements 10,123 8,594 Machinery and equipment 47,042 44,690 Construction in process 17,906 8,088 Total property, plant and equipment 76,401 62,702 Less: accumulated depreciation 26,008 18,973 Property, plant and equipment, net $ 50,393 $ 43,729 The Company’s long-lived assets by geographic locations are as follows: September 26, December 31, 2021 2020 United States $ 48,359 $ 42,264 International 2,034 1,465 Total property, plant and equipment, net 50,393 43,729

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	9 Months Ended
	Sep. 26, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Other Intangible Assets	5. GOODWILL AND OTHER INTANGIBLE ASSETS The following presents changes to goodwill for the period indicated: For the thirty-nine weeks Balance at December 31, 2020 $ 359,099 Advance Engine Management acquisition 17,426 Classic Instruments acquisition 4,912 Measurement period adjustments* 423 Balance at September 26, 2021 $ 381,860 * See Note 2, " Business Combination and Acquisitions - Simpson Performance Products, Inc. and Advance Engine Management Inc. " Goodwill represents the premium paid over the fair value of the net tangible and identifiable intangible assets acquired in the Company's business combinations. The measurement period for the valuation of assets acquired and liabilities assumed ends as soon as information on the facts and circumstances that existed as of the acquisition date becomes available, not to exceed 12 months. Adjustments in purchase price allocations may require a change in the amounts allocated to goodwill during the periods in which the adjustments are determined. Intangible assets consisted of the following: September 26, 2021 Gross Carrying Amount Accumulated Amortization Net Carrying Value Finite-lived intangible assets: Customer relationships $ 259,907 $ ( 29,878 ) $ 230,029 Tradenames 13,775 ( 3,906 ) 9,869 Technology 26,673 ( 8,469 ) 18,204 Total finite-lived intangible assets $ 300,355 $ ( 42,253 ) $ 258,102 Indefinite-lived intangible assets: Tradenames $ 163,768 — $ 163,768 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Carrying Value Finite-lived intangible assets: Customer relationships $ 245,274 $ ( 21,819 ) $ 223,455 Tradenames 13,775 ( 3,369 ) 10,406 Technology 24,595 ( 6,674 ) 17,921 Total finite-lived intangible assets $ 283,644 $ ( 31,862 ) $ 251,782 Indefinite-lived intangible assets: Tradenames $ 152,740 — $ 152,740 The following outlines the estimated future amortization expense related to intangible assets held as of September 26, 2021: 2021 (excluding the thirty-nine weeks ended September 26, 2021) $ 3,573 2022 14,202 2023 14,039 2024 13,226 2025 13,189 Thereafter 199,873 Total $ 258,102

DEBT

DEBT	9 Months Ended
	Sep. 26, 2021
Debt Disclosure [Abstract]
Debt	DEBT Debt of the Company consisted of the following: September 26, December 31, 2021 2020 First lien note $ 539,202 $ 541,969 Second lien note 45,000 145,000 Other 4,320 4,701 Less unamortized debt issuance costs ( 12,600 ) ( 16,684 ) 575,922 674,986 Less current portion of long-term debt ( 5,528 ) ( 5,528 ) $ 570,394 $ 669,458 The first lien note totals $ 600,000 , comprising of two parts: a revolving component with maximum borrowings of $ 50,000 , and a $ 550,000 term loan. Interest is based on LIBOR or the prime rate at the Company’s option, plus the applicable margin rate. Interest is due monthly for the prime rate loans and every one to three months for the LIBOR rate loans. The interest rate for the first lien note LIBOR rate loans was 5.1 % and 5.2 % at September 26, 2021 and December 31, 2020 , respectively. There were no prime rate loans as of September 26, 2021 or December 31, 2020 . Principal payments of $ 1,382 are due on a quarterly basis. The note is secured by the assets of the Company and the revolving credit facility matures in October 2023 , while the term loan matures in October 2025 . The note requires that the Company maintain a certain fixed charge coverage ratio. At September 26, 2021, the Company was in compliance with all financial covenants. In addition, the Company had outstanding letters of credit under the note, which totaled $ 1,200 at September 26, 2021 and December 31, 2020. The second lien note totals $ 145,000 . On July 16, 2021, the Company used a portion of the net proceeds from the Business Combination to repay $ 100,000 of the outstanding principal of the second lien note, which resulted in a loss of $ 1,425 from the write-off of unamortized debt issuances costs. Interest is based on LIBOR or the prime rate at the Company’s option, plus the applicable margin rate. Interest is due monthly for the prime rate loans and every one to three months for the LIBOR rate loans. The interest rate for the second lien note LIBOR rate loan was 8.5 % % and 8.7 % at September 26, 2021 and December 31, 2020, respectively. The note is secured by a second lien on the assets of the Company and matures in October 2026. The note requires that the Company maintain a certain fixed charge coverage ratio. At September 26, 2021, the Company was in compliance with all financial covenants. Sentinel Capital Partners Junior Fund I, a related party, holds a portion of the second lien note and the outstanding balance at September 26, 2021 and December 31, 2020 was $ 6,207 and $ 20,000 , respectively. Future maturities of long-term debt and amortization of debt issuance costs as of September 26, 2021 are as follows: Debt Debt Issuance Costs 2021 (remaining three months) $ 2,765 $ 703 2022 5,528 2,899 2023 5,528 3,019 2024 5,528 3,148 2025 519,853 2,746 Thereafter 49,320 85 $ 588,522 $ 12,600

COMMITMENTS

COMMITMENTS	9 Months Ended
	Sep. 26, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	16. COMMITMENTS AND CONTINGENCIES The Company is a party to various lawsuits and claims in the normal course of business. While the lawsuits and claims against the Company cannot be predicted with certainty, management believes that the ultimate resolution of the matters will not have a material effect on the consolidated financial position or results of operations of the Company. In September 2021, the Company experienced a cybersecurity incident. For details regarding this incident, see Part II - Other Information, Item 1A - Risk Factors of this Form 10-Q. The Company generally warrants its products against certain manufacturing and other defects. These product warranties are provided for specific periods of time depending on the nature of the product. The accrued product warranty costs are based primarily on historical experience of actual warranty claims and are recorded at the time of the sale. The following table provides the changes in the Company's accrual for product warranties, which is classified as a component of accrued liabilities in the condensed consolidated balance sheets. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Beginning balance $ 2,928 $ 2,962 $ 3,989 $ 3,454 Accrued for current year 2,027 3,710 5,462 7,637 Settlement of warranty claims ( 2,310 ) ( 3,176 ) ( 6,806 ) ( 7,595 ) Ending balance $ 2,645 $ 3,496 $ 2,645 $ 3,496

LEASE COMMITMENTS

LEASE COMMITMENTS	9 Months Ended
	Sep. 26, 2021
Leases, Operating [Abstract]
LEASE COMMITMENTS	14. LEASE COMMITMENTS The Company is obligated under various operating leases for manufacturing facilities, equipment and automobiles. Leases have a remaining term of one to ten years some of which have an option to renew. The aggregate future minimum fixed lease obligations under operating leases for the Company as of September 26, 2021, are as follows: 2021 (excluding the thirty-nine weeks ended September 26, 2021) $ 1,705 2022 6,485 2023 5,036 2024 3,679 2025 2,752 Thereafter 11,045 For the 13-week periods ended September 26, 2021 and September 27, 2020, total rent expense under operating leases approximated $ 1,992 and $ 968 , respectively. For the 39-week periods ended September 26, 2021 and September 27, 2020, total rent expense under operating leases approximated $ 5,665 and $ 3,337 , respectively. Taxes, insurance and maintenance expenses relating to all leases are obligations of the Company.

BUSINESS COMBINATION AND ACQUIS

BUSINESS COMBINATION AND ACQUISITIONS	9 Months Ended
	Sep. 26, 2021
Business Combinations [Abstract]
BUSINESS COMBINATION AND ACQUISITIONS	2. BUSINESS COMBINATION AND ACQUISITIONS BUSINESS COMBINATION On July 16, 2021, Holley consummated the Business Combination pursuant to the terms of the Merger Agreement, whereby Merger Sub I, a direct wholly owned subsidiary of Empower, merged with and into Holley Intermediate, with Holley Intermediate surviving such merger as a wholly owned subsidiary of Holley (“Merger I”) and (ii) Merger Sub II, a direct wholly owned subsidiary of Empower, merged with and into Holley Intermediate, with Merger Sub II surviving such merger as a wholly owned subsidiary of Holley (“Merger II”). Pursuant to the Merger Agreement, at the Closing, all outstanding shares of Holley Intermediate common stock as of immediately prior to the effective time of Merger I were cancelled and Holley Parent Holdings, LLC, the sole stockholder of Holley Intermediate (the “Holley Stockholder” or “Parent”), received $ 264,718 in cash and 67,673,884 shares of common stock (at a deemed value of $ 10.00 per share). The Company’s common stock is listed on the NYSE under the symbol “HLLY.” In connection with the Business Combination, a number of subscribers purchased from the Company an aggregate of 24,000,000 shares of common stock (the “PIPE”), for a purchase price of $ 10.00 per share, or $ 240,000 in the aggregate. Per the Merger Agreement, $100,000 of the PIPE proceeds were used to partially pay off Holley’s debt. Pursuant to the Amended and Restated Forward Purchase Agreement (“A&R FPA”), at the Closing, 5,000,000 shares of the Company’s common stock and 1,666,667 warrants were issued to certain investors for an aggregate purchase price of $ 50,000 . Pursuant to the A&R FPA, each warrant entitles the holder to purchase one share of the Company’s common stock at a price of $ 11.50 per share (the ”Public Warrants”), subject to certain conditions. The Company also assumed 8,333,310 Public Warrants and 4,666,667 private placement warrants (the “Private Warrants”, and together with the Public Warrants, the “Warrants”) upon the Business Combination, all of which were issued in connection with Empower’s initial public offering. Each Warrant represents the right to purchase one share of the Company’s common stock at a price of $ 11.50 per share, subject to certain conditions. The Warrants are exercisable commencing on October 9, 2021 (the one-year anniversary of Empower’s initial public offering) and expire on July 16, 2026 ( five years after the Closing Date). The Public Warrants are listed on the NYSE under the symbol “HLLY WS.” Additionally, Empower Sponsor Holdings LLC (the "Sponsor") may be entitled to receive up to 2,187,500 shares of the Company’s common stock vesting in two equal tranches upon achieving certain market share price milestones as outlined in the Merger Agreement during the earn-out period (“the “Earn-Out Shares”). The Earn-Out Shares will be forfeited if the applicable conditions are not satisfied before July 16, 2028 (seven years after the Closing Date). The earnout is classified as a liability in the condensed consolidated balance sheet and is remeasured at fair value with changes in the post-Business Combination fair value recognized in the Company’s condensed consolidated statement of comprehensive income as non-operating expense. The Business Combination was accounted for as a reverse recapitalization in accordance with U.S. GAAP. This determination was primarily based on current shareholders of Holley having a relative majority of the voting power of the Company, the operations of Holley prior to the acquisition comprising the only ongoing operations of the Company, and senior management of Holley comprising the majority of the senior management of the Company. Under this method of accounting, Empower was treated as the acquired company for financial reporting. Accordingly, the Business Combination was accounted for as the equivalent of Holley issuing stock for the net assets of Empower, accompanied by a recapitalization. The net assets of Empower are stated at historical cost, with no goodwill or other intangible assets recorded. Reported amounts from operations included herein prior to the Business Combination are those of Holley Intermediate. The shares and corresponding capital amounts and earnings per share, prior to the Business Combination, have been retroactively restated based on shares received by the Holley Stockholder. The following table reconciles the elements of the Business Combination to the condensed consolidated statements of cash flows for the 39-week period ended September 26, 2021: Recapitalization Cash - Empower's trust and cash (net of redemptions of $ 99,353 and 44,314 ) $ 107,042 Cash - Forward Purchase Agreement 50,000 Cash - PIPE Financing 240,000 Net cash provided by Business Combination and PIPE Financing 397,042 Less: cash consideration paid to Holley Stockholder ( 264,718 ) Net contributions from Business Combination and PIPE Financing $ 132,324 ACQUISITIONS Drake Automotive Group LLC On November 11, 2020 , the Company acquired Drake Automotive Group LLC (“Drake”). The purchase price was $ 49,104 . The Company acquired 100 % of the outstanding member units of Drake. The Company purchased Drake in order to acquire strong brands in the automotive aftermarket. The transaction was accounted for as a business combination under the acquisition method of accounting. Accordingly, the purchase price has been allocated based upon the fair value of the assets acquired and liabilities assumed. Consideration for the assets acquired consisted of cash payments of $ 47,104 plus an earn-out value of $ 2,000 . The acquisition resulted in both amortizable and non-amortizable intangibles and goodwill, totaling $ 32,441 . The goodwill arising from the acquisition is primarily due to Drake’s strong market position. The goodwill and intangibles generated as a result of this acquisition are deductible for income tax purposes. The purchase price was funded from the proceeds of debt and cash on hand. The purchase agreement included a potential contingent payment based on 2020 performance. The seller could earn up to an additional $ 2,000 . The fair value of this contingent payment was determined to be $ 2,000 based on the likelihood of achieving the required financial performance at the time of the valuation. The earn-out payment of $2,000 was paid in March 2021. The allocation of the purchase price to the assets acquired and liabilities assumed was based on estimates of the fair value of the net assets as follows: Cash $ 205 Accounts receivable 3,947 Inventory 14,198 Property, plant and equipment 1,296 Other assets 189 Tradenames 7,715 Customer relationships 17,175 Goodwill 7,551 Accounts payable ( 2,524 ) Accrued liabilities ( 648 ) $ 49,104 The fair value of the acquired customer relationship intangible asset was estimated using the excess earnings approach. The customer relationship intangible asset is being amortized based on the attrition rate of customers which was determined to be 20 years . The fair value of the acquired tradenames intangible asset was estimated using the relief from royalty method, a form of the income approach. The tradenames were determined to have an indefinite life. The contractual value of the accounts receivable acquired was $ 4,155 . Simpson Performance Products, Inc. On November 16, 2020 , the Company acquired Simpson Performance Products, Inc. (“Simpson”). The purchase price was $ 117,409 . The Company acquired 100 % of the outstanding common stock of Simpson. The Company purchased Simpson in order to acquire strong brands in the automotive safety solutions market. The transaction was accounted for as a business combination under the acquisition method of accounting. Accordingly, the purchase price has been allocated based upon the fair value of the assets acquired and liabilities assumed. Consideration for the assets acquired consisted of cash payments of $ 110,209 and an earnout initially valued at $ 7,200 . The acquisition resulted in both amortizable and non-amortizable intangibles and goodwill, totaling $ 107,618 . The goodwill arising from the acquisition is primarily due to Simpson’s strong market position. The goodwill and intangibles generated as a result of this acquisition are not deductible for income tax purposes. The purchase price was funded from the proceeds of debt and cash on hand. The purchase agreement included a potential contingent payment based on the performance for the twelve months ended October 3, 2021. The seller could earn up to an additional $ 25,000 . The fair value of this contingent payment was initially determined to be $ 7,200 using the “Bull Call” option strategy utilizing the option values from the Black-Scholes Option Pricing Model. Based on actual performance and updated projections of Simpson’s performance for the earn-out period, the fair value of the contingent payment was determined to be $ 24,373 as of March 28, 2021. Therefore, during the thirteen weeks ended March 28, 2021, an adjustment of $ 17,173 was recorded as expense, which is recognized in acquisition and restructuring costs in the condensed consolidated statement of comprehensive income for the 39-week period ended September 26, 2021. The determination of the final purchase price allocation to specific assets acquired and liabilities assumed was adjusted to reflect the final fair value estimate of finished goods inventory, as noted below. The allocation of the purchase price to the assets acquired and liabilities assumed was based on estimates of the fair value of the net assets as follows: November 16, 2020 (as initially reported) Measurement Period Adjustments November 16, 2020 (as adjusted) Cash $ 7,715 $ — $ 7,715 Accounts receivable 3,894 — 3,894 Inventory 19,265 ( 770 ) 18,495 Property, plant and equipment 5,952 — 5,952 Other assets 1,613 — 1,613 Tradenames 23,980 — 23,980 Customer relationships 28,770 — 28,770 Patents 2,720 — 2,720 Goodwill 51,305 843 52,148 Accounts payable ( 2,483 ) — ( 2,483 ) Accrued liabilities ( 7,787 ) — ( 7,787 ) Deferred tax liability ( 12,993 ) — ( 12,993 ) Debt ( 4,615 ) — ( 4,615 ) $ 117,336 $ 73 $ 117,409 The fair value of the acquired customer relationship intangible asset was estimated using the excess earnings approach. The customer relationship intangible asset is being amortized based on the attrition rate of customers which was determined to be 20 years. The fair value of the acquired tradenames and patents intangible assets were estimated using the relief from royalty method, a form of the income approach. The tradenames were determined to have an indefinite life. The patents are being amortized over 10 years based on the weighted average remaining life of the patent portfolio. The contractual value of the accounts receivable acquired was $ 3,894 . Detroit Speed, Inc. On December 18, 2020 , the Company acquired Detroit Speed, Inc. (“Detroit Speed”). The purchase price was $ 11,297 . The Company acquired substantially all of the assets and liabilities of Detroit Speed. The Company purchased Detroit Speed in order to acquire strong brands in the automotive aftermarket. The transaction was accounted for as a business combination under the acquisition method of accounting. Accordingly, the purchase price has been allocated based upon the fair value of the assets acquired and liabilities assumed. Consideration for the assets acquired includes cash payments of $ 9,297 and Class A Units of Parent of $ 2,000 . The acquisition resulted in both amortizable and non-amortizable intangibles and goodwill, totaling $ 4,323 . The goodwill arising from the acquisition is primarily due to Detroit Speed’s strong market position. The goodwill and intangibles generated as a result of this acquisition are partially deductible for income tax purposes. The purchase price was funded from cash on hand and distribution of Class A Units of Parent. The allocation of the purchase price to the assets acquired and liabilities assumed was based on estimates of the fair value of the net assets as follows: Cash $ 1,784 Accounts receivable 418 Inventory 3,478 Property, plant and equipment 3,040 Other assets 215 Tradenames 1,127 Customer relationships 560 Goodwill 2,636 Accounts payable ( 668 ) Accrued liabilities ( 1,019 ) Deferred tax liability ( 274 ) $ 11,297 The fair value of the acquired customer relationship intangible asset was estimated using the excess earnings approach. The customer relationship intangible asset is being amortized based on the attrition rate of customers which was determined to be 10 years. The fair value of the acquired tradenames intangible asset was estimated using the relief from royalty method, a form of the income approach. The tradenames were determined to have an indefinite life. The contractual value of the accounts receivable acquired was $ 418 . Advance Engine Management Inc. On April 14, 2021 , the Company acquired Advance Engine Management Inc. doing business as AEM Performance Electronics (“AEM”). The purchase price was cash consideration of $ 51,243 . The Company acquired substantially all of the assets and liabilities of AEM. The Company purchased AEM in order to acquire strong brands in the automotive aftermarket. The transaction was accounted for as a business combination under the acquisition method of accounting. Accordingly, the purchase price has been allocated based upon the fair value of the assets acquired and liabilities assumed. The acquisition resulted in both amortizable and non-amortizable intangibles and goodwill, totaling $ 44,906 . The goodwill arising from the acquisition is primarily due to AEM’s strong market position. The goodwill and intangibles generated as a result of this acquisition are deductible for income tax purposes. The purchase price was funded from cash on hand. The determination of the final purchase price allocation to specific assets acquired and liabilities assumed was adjusted to reflect the final fair value estimate of acquired assets and liabilities, as noted below. The allocation of the purchase price to the assets acquired and liabilities assumed was based on estimates of the fair value of the net assets as follows: April 14, 2021 (as initially reported) Measurement Period Adjustments April 14, 2021 (as adjusted) Accounts receivable $ 3,454 $ ( 61 ) $ 3,393 Inventory 3,892 — 3,892 Property, plant and equipment 1,342 — 1,342 Other assets 493 ( 91 ) 402 Tradenames 10,760 — 10,760 Customer relationships 14,640 — 14,640 Patents 1,970 — 1,970 Technology intangibles 110 — 110 Goodwill 17,426 ( 420 ) 17,006 Accounts payable ( 2,032 ) 110 ( 1,922 ) Accrued liabilities ( 489 ) 139 ( 350 ) $ 51,566 $ ( 323 ) $ 51,243 The fair value of the acquired customer relationship intangible asset was estimated using the excess earnings approach. The customer relationship intangible asset is being amortized based on the attrition rate of customers which was determined to be 20 years. The fair value of the acquired tradenames and patents intangible assets were estimated using the relief from royalty method, a form of the income approach. The tradenames were determined to have an indefinite life. The patents are being amortized over 13 years based on the weighted average remaining life of the patent portfolio. The contractual value of the accounts receivable acquired was $ 3,454 . The Company’s results for the 13-week and 39-week periods ended September 26, 2021 include $ 5,904 and $ 11,341 of net sales, respectively, and $ 896 and $ 1,583 of net income, respectively, from AEM since the date of acquisition. The Company incurred transaction costs in the amount of $ 46 and $ 2,251 , which are reflected in operating expenses in the 13-week and 39-week periods ended September 26, 2021, respectively. The following table provides the unaudited consolidated pro forma results for the periods presented as if AEM had been acquired as of January 1, 2020. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Pro forma net sales $ 159,673 $ 140,195 $ 521,836 $ 384,237 Pro forma net income ( 30,200 ) 15,045 ( 6,906 ) 33,195 The pro forma results include the effects of the amortization of purchased intangible assets and acquired inventory step-up. The pro forma results are based upon unaudited financial information of the acquired entity and are presented for informational purposes only and are not necessarily indicative of the results of future operations or the results that would have occurred had the acquisitions taken place in the periods noted. Finspeed LLC On May 24, 2021 , the Company acquired Finspeed LLC (“Finspeed”). The purchase price was cash consideration of $ 2,505 . The Company acquired substantially all of the assets and liabilities of Finspeed. The transaction was accounted for as a business combination under the acquisition method of accounting. Accordingly, the purchase price has been allocated based upon the fair value of the assets acquired and liabilities assumed. The acquisition resulted in non-amortizable intangibles of $ 268 . The purchase price was funded from cash on hand. Classic Instruments LLC On August 31, 2021 , the Company acquired Classic Instruments LLC ("Classic Instruments"). The purchase price was cash consideration of $ 6,120 . The Company acquired substantially all of the assets and liabilities of Classic Instruments. The transaction was accounted for as a business combination under the acquisition method of accounting. Accordingly, the purchase price has been allocated based upon the fair value of the assets acquired and liabilities assumed. The determination of the purchase price allocation to specific assets acquired and liabilities assumed is incomplete for Classic Instruments. The acquisition resulted in intangibles and goodwill of approximately $ 4,912 . The purchase price was funded from cash on hand.

COMMON STOCK WARRANTS

COMMON STOCK WARRANTS	9 Months Ended
	Sep. 26, 2021
Warrant Liability [Abstract]
COMMON STOCK WARRANTS	7. COMMON STOCK WARRANTS Upon the Closing, there were 14,666,644 Warrants, consisting of 9,999,977 Public Warrants and 4,666,667 Private Warrants, outstanding to purchase shares of the Company's common stock that were issued by Empower prior to the Business Combination. Each warrant entitles the registered holder to purchase one share of the Company's common stock at a price of $ 11.50 per share, subject to adjustments, commencing on October 9, 2021 (the one-year anniversary of Empower’s initial public offering), provided that the Company has an effective registration statement under the Securities Act covering the shares of common stock issuable upon exercise of the warrants and a current prospectus relating to them is available and such shares are registered, qualified or exempt from registration under the securities laws of the state of residence of the holder. The Warrants may be exercised only for a whole number of shares of the Company’s common stock. The Warrants expire on July 16, 2026 , the date that is five years after the Closing date, or earlier upon redemption or liquidation. Additionally, the Private Warrants will be non-redeemable and are exercisable on a cashless basis so long as they are held by the Sponsor or any of its permitted transferees. If the Private Warrants are held by someone other than the Sponsor or its permitted transferees, the Private Warrants will be redeemable by the Company and exercisable by such holders on the same basis as the Public Warrants. The Company may redeem the Public Warrants at a price of $ 0.01 per warrant upon 30 days' notice if the closing price of the Company’s common stock equals or exceeds $ 18.00 per share, subject to adjustments, on the trading day prior to the date on which notice of redemption is given, provided there is an effective registration statement and current prospectus in effect with respect to the ordinary shares underlying such Warrants throughout the 30-day redemption period. If the foregoing conditions are satisfied and the Company issues a notice of redemption of the Warrants, the Warrant holder is entitled to exercise his, her or its Warrant prior to the scheduled redemption date. Any such exercise requires the Warrant holder to pay the exercise price for each Warrant being exercised. Further, the Company may redeem the Public Warrants at a price of $ 0.10 per warrant upon 30 days' notice if the closing price of the Company’s common stock equals or exceeds $ 10.00 per share, subject to adjustments, on the trading day prior to the date on which notice of redemption is given. Beginning on the date the notice of redemption is given until the Warrants are redeemed or exercised, holders may elect to exercise their Warrants on a cashless basis and receive that number of shares of the Company’s common stock as determined by reference to a table in the warrant agreement. If a registration statement is not effective within 60 days following the Closing, warrant holders may, until such time as there is an effective registration statement and during any period when the Company has failed to maintain an effective registration statement, exercise warrants on a cashless basis in accordance with Section 3(a)(9) of the Securities Act or another exemption, but the Company will use its commercially reasonable best efforts to register or qualify the shares under applicable blue sky laws to the extent an exemption is not available. The Company’s Warrants were accounted for as liabilities in accordance with ASC 815-40 and are presented as warrant liability on the balance sheet. The warrant liability was measured at fair value at inception and on a recurring basis, with changes in fair value recognized as non-operating expense. As of September 26, 2021, a warrant liability with a fair value of $ 45,986 was reflected as a long-term liability in the condensed consolidated balance sheet, and a $ 17,273 increase in the fair value of the warrant liability was reflected as change in fair value of warrant liability in the condensed consolidated statements of comprehensive income for the 13-week and 39-week periods ended September 26, 2021 .

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	9 Months Ended
	Sep. 26, 2021
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	8. FAIR VALUE MEASUREMENTS The Company’s financial liabilities subject to fair value measurement on a recurring basis and the level of inputs used for such measurements were as follows: Fair Value Measured as of September 26, 2021 Level 1 Level 2 Level 3 Total Liabilities included in: Warrant liability (Public) $ 30,400 $ — $ — $ 30,400 Warrant liability (Private) — — 15,586 15,586 Acquisition contingent consideration — — 24,373 24,373 Earn-out liability — — 24,588 24,588 Total fair value $ 30,400 $ — $ 64,547 $ 94,947 As of September 26, 2021, the Company's derivative liabilities for its private and public warrants, the earn-out liability (see Note 2, “ Business Combination and Acquisitions,” for more details), and the acquisition contingent consideration payable are measured at fair value on a recurring basis. The fair value for the private warrants, earn-out liability, and acquisition contingent consideration payable are determined based on significant inputs not observable in the market (Level 3). The valuation of the Level 3 liabilities uses assumptions and estimates the Company believes would be made by a market participant in making the same valuation. The Company assesses these assumptions and estimates on an on-going basis as additional data impacting the assumptions and estimates are obtained. The Company uses a Monte Carlo simulation model to estimate the fair value of its private warrants and earn-out liability. The fair value of the public warrants is determined using publicly traded prices (Level 1). Changes in the fair value of the derivative liabilities related to warrants and the earn-out liability are recognized as non-operating expense in the condensed consolidated statements of comprehensive income. Changes in the fair value of acquisition contingent consideration payable are recognized as acquisition and restructuring costs in the condensed consolidated statements of comprehensive income. The fair value of private warrants was estimated as of September 26, 2021 using the Monte Carlo simulation model with the following assumptions: Valuation date price $ 12.21 Strike price $ 11.50 Remaining life 4.81 years Expected dividend $ - Risk-free interest rate 0.93 % Price threshold $ 18.00 The fair value of the earn-out liability was estimated as of September 26, 2021 using the Monte Carlo simulation model with the following assumptions: Valuation date price $ 12.21 Expected term 6.81 years Expected volatility 38.24 % Risk-free interest rate 1.25 % Price hurdle 1 $ 13.00 Price hurdle 2 $ 15.00 As of September 26, 2021 and December 31, 2020, the Company has accounts receivable, accounts payable and accrued expenses for which the carrying value approximates fair value due to the short-term nature of these instruments. The carrying value of the Company’s long-term debt approximates fair value as the rates used approximate the market rates currently available to the Company. Fair value measurements used in the impairment reviews of goodwill and intangible assets are Level 3 measurements. The reconciliation of changes in Level 3 during the 13-week and 39-week periods ended September 26, 2021 is as follows: For the thirty-nine weeks ended September 26, 2021 Private Warrants Acquisition Contingent Consideration Earn-Out Liability Total Balance on December 31, 2020 $ — $ 9,200 $ — $ 9,200 Cash paid for contingent consideration — ( 2,000 ) — ( 2,000 ) Liabilities assumed in recapitalization 9,613 — 17,722 27,335 Losses included in earnings 5,973 17,173 6,866 30,012 Balance on September 26, 2021 $ 15,586 $ 24,373 $ 24,588 $ 64,547

REVENUE

REVENUE	9 Months Ended
	Sep. 26, 2021
Revenue from Contract with Customer [Abstract]
REVENUE	9. REVENUE The principal activity from which the Company generates its revenue is the manufacturing and distribution of after-market automotive parts for its customers, comprised of resellers and end users. The Company recognizes revenue at a point in time, rather than over time, as the performance obligation is satisfied when customer obtains control of the product upon title transfer and not as the product is manufactured or developed. The amount of revenue recognized is based on the purchase order price and adjusted for revenue allocated to variable consideration (i.e., estimated rebates, co-op advertising, etc.). The Company collects sales tax and other taxes concurrent with revenue-producing activities which are excluded from revenue. Shipping and handling costs incurred after control of the product is transferred to our customers are treated as fulfillment costs and not a separate performance obligation. The Company allows customers to return products when certain Company-established criteria are met. These sales returns are recorded as a charge against gross sales in the period in which the related sales are recognized, net of returns to stock. Returned products, which are recorded as inventories, are valued at the lower of cost or net realizable value. The physical condition and marketability of the returned products are the major factors considered in estimating realizable value. The Company also estimates expected sales returns and records the necessary adjustment as a charge against gross sales. The Company’s payment terms with customers are customary and vary by customer and geography but typically range from 30 to 365 days. The Company elected the practical expedient to disregard the possible existence of a significant financing component related to payment on contracts, as the Company expects that customers will pay for the products within one year. The Company has evaluated the terms of our arrangements and determined that they do not contain significant financing components. Additionally, as all contracts with customers have an expected duration of one year or less, the Company has elected the practical expedient to exclude disclosure of information regarding the aggregate amount and future timing of performance obligations that are unsatisfied or partially satisfied as of the end of the reporting period. The Company provides limited warranties on most of its products against certain manufacturing and other defects. Provisions for estimated expenses related to product warranty are made at the time products are sold. Refer to Note 16 for more information. The following table summarizes total revenue by product category: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Electronic systems $ 77,199 $ 70,371 $ 241,474 $ 197,493 Mechanical systems 37,026 29,383 118,295 85,218 Exhaust 16,971 18,905 59,587 53,062 Accessories 14,384 14,648 45,403 29,987 Safety 14,093 — 48,287 — Total sales $ 159,673 $ 133,307 $ 513,046 $ 365,760 The following table summarizes total revenue based on geographic location from which the product is shipped: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 United States $ 155,626 $ 133,307 $ 501,196 $ 365,760 Italy 4,047 — 11,850 — Total sales $ 159,673 $ 133,307 $ 513,046 $ 365,760

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 26, 2021
Income Tax Disclosure [Abstract]
INCOME TAXES	10. INCOME TAXES The Company's effective income tax rate is based on expected income, statutory rates and tax planning opportunities available in the various jurisdictions in which it operates. For interim financial reporting, the Company estimates the annual income tax rate based on projected taxable income for the full year and records a quarterly income tax provision or benefit in accordance with the anticipated annual rate. The Company refines the estimates of the year's taxable income as new information becomes available, including actual year-to-date financial results. This continual estimation process often results in a change to the expected effective income tax rate for the year. When this occurs, the Company adjusts the income tax provision during the quarter in which the change in estimate occurs so that the year-to-date provision reflects the expected income tax rate. Significant judgment is required in determining the effective tax rate and in evaluating tax positions. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Income tax expense $ ( 3,301 ) $ 5,512 $ 7,255 $ 9,656 Effective tax rates 9.9 % 28.9 % nm 23.8 % nm - not meaningful For the 13-week periods ended September 26, 2021 and September 27, 2020, the Company’s effective tax rates of 9.9 % and 28.9 % , respectively differed from the 21 % federal statutory rate primarily due to permanent differences. For the 39-week period ended September 26, 2021, the Company recognized tax expense on a net loss for the period due to permanent differences related to the Business Combination and the increase in the Simpson earn-out liability recognized during the thirteen weeks ended March 28, 2021. For the 39-week period ended September 27, 2020, the Company’s effective tax rate of 23.8 % differed from the 21 % federal statutory rate primarily due to permanent differences.

EARNINGS PER SHARE

EARNINGS PER SHARE	9 Months Ended
	Sep. 26, 2021
Earnings Per Share [Abstract]
Earnings Per Share	11. EARNINGS PER SHARE The following table sets forth the calculation of basic and diluted earnings per share: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Numerator: Net income $ ( 30,200 ) $ 13,543 $ ( 9,158 ) $ 30,904 Denominator: Weighted average common 106,285,072 67,673,884 80,735,661 67,673,884 Dilutive effect of potential common shares - - - - Weighted average common 106,285,072 67,673,884 80,735,661 67,673,884 Earnings per share: Basic $ ( 0.28 ) $ 0.20 $ ( 0.11 ) $ 0.46 Diluted $ ( 0.28 ) $ 0.20 $ ( 0.11 ) $ 0.46 The following outstanding shares of common stock equivalents were excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Anti-dilutive shares excluded Warrants 14,666,644 — 14,666,644 — Stock options 1,394,008 — 1,394,008 — Restricted stock units 658,891 — 658,891 — Earn-out shares 2,187,500 — 2,187,500 — Total anti-dilutive shares 18,907,043 — 18,907,043 —

BENEFIT PLANS

BENEFIT PLANS	9 Months Ended
	Sep. 26, 2021
Retirement Benefits [Abstract]
BENEFIT PLANS	12. BENEFIT PLANS The following summarizes the components of net periodic benefit cost for the defined benefit pension plan: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Components of Expense: Service cost $ 35 $ 40 $ 107 $ 120 Interest cost 38 48 114 144 Expected return on plan ( 58 ) ( 64 ) ( 180 ) ( 192 ) Amortization of net loss 9 — 19 — Net periodic benefit cost $ 24 $ 24 $ 60 $ 72 The Company made matching contributions totaling $ 1,019 and $ 757 to our 401(k) plan during the 13-week periods ended September 26, 2021 and September 27, 2020, respectively. The Company made matching contributions totaling $ 2,020 and $ 1,558 to our 401(k) plan during the 39-week periods ended September 26, 2021 and September 27, 2020, respectively. The Company made contributions of $ 300 and $ 294 to our defined benefit pension plan during the 13-week periods ended September 26, 2021 and September 27, 2020, respectively. The Company made contributions of $ 417 and $ 477 to our defined benefit pension plan during the 39-week periods ended September 26, 2021 and September 27, 2020 , respectively.

EQUITY-BASED COMPENSATION PLANS

EQUITY-BASED COMPENSATION PLANS	9 Months Ended
	Sep. 26, 2021
Share-based Payment Arrangement [Abstract]
EQUITY-BASED COMPENSATION PLANS	13. EQUITY-BASED COMPENSATION PLANS In 2021, the Company adopted the 2021 Omnibus Incentive Plan (the “2021 Plan”), which provides for the grant of restricted stock awards, incentive and nonqualified stock options, and other share based awards to employees, directors and non-employees. The 2021 Plan authorized 8,850,000 new shares of the Company’s common stock to be available for award grants. As of September 26, 2021, 6,797,101 shares of common stock remained available for future issuance under the 2021 Plan. Equity-based compensation expense included the following components: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Stock options $ 376 $ — $ 376 $ — Profit interest units 2,110 121 2,372 356 All equity-based compensation expense is recorded in selling, general and administrative costs in the condensed consolidated statements of comprehensive income. Stock Options Stock option grants have an exercise price at least equal to the market value of the underlying common stock on the date of grant, have ten-year terms, and vest ratably over three years of continued employment. In general, vested options expire if not exercised at termination of service. On July 16, 2021, the Company granted 1,394,008 options to purchase shares of the Company’s common stock to key employees. These stock options had a weighted-average grant date fair value $ 3.88 per share and remain outstanding and unvested as of September 26, 2021. Compensation expense for stock options is recorded based on straight-line amortization of the grant date fair value over the requisite service period. As of September 26, 2021, there was $ 5,033 of unrecognized compensation cost related to unvested stock options that is expected to be recognized over a remaining weighted-average period of 2.8 years. The fair value of each stock option granted on July 16, 2021 was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions: Weighted-average expected term 6.0 Expected volatility 40.3 % Expected dividend $ — Risk-free interest rate 0.94 % The expected term has been estimated using a simplified method, which calculates the expected term as the mid-point between the vesting date and the contractual life of the awards since the Company does not have an extended history of actual exercises. The expected dividend yield is assumed to be zero since the Company has never paid dividends and does not have current plans to pay any dividends. The risk-free interest rate is based on yields of U.S. Treasury securities with maturities similar to the expected term of the options. Expected volatility is based on an evenly weighted blend of implied volatility and historical volatility of publicly-traded peer companies since the Company has limited historical volatility. Restricted Stock Units Restricted stock units (“RSUs”) vest ratably over one to three years from the anniversary of the Closing Date, or July 16, 2021, and expire ten years from the date of grant. The fair value of a RSU at the grant date is equal to the market price of the Company’s common stock on the grant date. On September 23, 2021, the Company granted 658,891 RSUs to key employees and directors. These RSUs had a weighted-average grant date fair value of $ 12.06 per unit and remain outstanding and unvested as of September 26, 2021. Compensation expense for RSUs is recorded based on amortization of the grant date fair market value over the period the restrictions lapse, As of September 26, 2021, there was $ 7,946 of unrecognized compensation cost related to unvested RSUs that is expected to be recognized over a remaining weighted average period of 2.5 years. Profit Interest Units The Holley Stockholder made grants of 8,445 and 5,932 profit interest units (“PIUs”) to certain employees of the Company during the thirty-nine week periods ended September 26, 2021, and September 27, 2020 , respectively. PIUs are a special type of limited liability company equity unit that allows the recipient to potentially participate in a future increase in the value of the Company. PIUs are issued for no consideration and generally provide for vesting over the requisite service period, subject to the recipient remaining an employee of the Company through each vesting date. The 2020 grants included 4,507 PIUs that contained certain performance vesting criteria related to the attainment of specified levels of return for certain other investors in Holley Stockholder. The weighted-average grant date fair value of these performance-based PIUs was $ 0.27 per unit. No expense has been recorded for the performance-based PIUs as meeting the necessary performance conditions for vesting is not considered probable. As of September 26, 2021 , there were 36,045 unvested PIUs with a weighted average grant date fair value of $ 0.64 . During the 39-week periods ended September 26, 2021 and September 27, 2020 , 2,169 and 1,228 PIUs were fully vested, respectively, with a total grant-date fair value of $ 2,110 and $ 356 in 2021 and 2020, respectively. As of September 26, 2021 , there was $ 15,999 of total unrecognized compensation cost related to unvested time-based PIUs that is expected to be recognized over a remaining weighted-average period of 1.9 years. During the 39-week period ended September 26, 2021 , 2,614 PIUs were forfeited.

ACQUISITION, RESTRUCTURING AND

ACQUISITION, RESTRUCTURING AND MANAGEMENT FEE COSTS	9 Months Ended
	Sep. 26, 2021
Business Combination and Asset Acquisition [Abstract]
Acquistion, Reconstructuring and Management Fee Cost	15. ACQUISITION, RESTRUCTURING AND MANAGEMENT FEE COSTS The following table summarizes total acquisition, restructuring and management fee costs: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Acquisitions (1) $ 204 $ 137 $ 3,415 $ 1,301 Restructuring (2) 140 955 1,265 4,323 Management fees (3) 23,274 894 25,813 2,665 Earn out adjustment (4) — — 17,173 — Total acquisition, restructuring $ 23,618 $ 1,986 $ 47,666 $ 8,289 (1) Includes professional fees for legal, accounting, consulting, administrative, and other professional services directly attributable to potential acquisitions. (2) Includes costs incurred as part of the restructuring of operations including professional and consulting services. (3) Includes acquisition costs and management fees paid to Sentinel Capital Partners, including a fee of $ 23,275 paid in the 13-week period ended September 26, 2021 upon the Closing of the Business Combination . (4) A fair value adjustment to the contingent consideration payable from the Simpson acquisition .

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 26, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	16. COMMITMENTS AND CONTINGENCIES The Company is a party to various lawsuits and claims in the normal course of business. While the lawsuits and claims against the Company cannot be predicted with certainty, management believes that the ultimate resolution of the matters will not have a material effect on the consolidated financial position or results of operations of the Company. In September 2021, the Company experienced a cybersecurity incident. For details regarding this incident, see Part II - Other Information, Item 1A - Risk Factors of this Form 10-Q. The Company generally warrants its products against certain manufacturing and other defects. These product warranties are provided for specific periods of time depending on the nature of the product. The accrued product warranty costs are based primarily on historical experience of actual warranty claims and are recorded at the time of the sale. The following table provides the changes in the Company's accrual for product warranties, which is classified as a component of accrued liabilities in the condensed consolidated balance sheets. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Beginning balance $ 2,928 $ 2,962 $ 3,989 $ 3,454 Accrued for current year 2,027 3,710 5,462 7,637 Settlement of warranty claims ( 2,310 ) ( 3,176 ) ( 6,806 ) ( 7,595 ) Ending balance $ 2,645 $ 3,496 $ 2,645 $ 3,496

DESCRIPTION OF THE BUSINESS, BA

DESCRIPTION OF THE BUSINESS, BASIS OF PRESENTATION, AND SUMMARY ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 26, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP" or “GAAP”) and applicable rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the Holley Intermediate Holdings, Inc. audited consolidated financial statements and notes thereto for the year ended December 31, 2020, as filed with the SEC in the Company’s prospectus filed pursuant to Rule 424(b)(3) on July 28, 2021. In management’s opinion, the unaudited interim condensed consolidated financial statements reflect all adjustments, which are of a normal and recurring nature, that are necessary for a fair presentation of financial results for the interim periods presented. Operating results for any quarter are not necessarily indicative of the results for the full fiscal year. The Company operates on a calendar year that ends on December 31, 2021 and 2020. The three and nine month periods ended September 26, 2021 and September 27, 2020 each included 13 weeks and 39 weeks, respectively.
Principles of Consolidation	Principles of Consolidation These unaudited condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All significant intercompany transactions and accounts have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. Significant areas for which management uses estimates include: (1) warranties; (2) allowance for credit losses; (3) inventory reserves; (4) asset impairments, including goodwill, intangible assets and other long-lived assets; (5) customer co-operative advertising; (6) sales returns and allowances; (7) tax positions; (8) deferred tax liabilities; and (9) fair value measurements, including equity awards and warrant and earn-out liabilities. These estimates require the use of judgment as future events and the effect of these events cannot be predicted with certainty. The estimates will change as new events occur, as more experience is acquired and as more information is obtained. The Company evaluates and updates assumptions and estimates on an ongoing basis and may consult outside experts to assist as considered necessary.
Emerging Growth Company Status	Emerging Growth Company Status Section 102(b)(1) of the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”), exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company is an emerging growth company, and, as such, has elected to take advantage of the benefits of the extended transition period for new or revised financial accounting standards.
Warrants	The Company reviews the terms of warrants to purchase its common stock to determine whether warrants should be classified as liabilities or stockholders' equity in its consolidated balance sheet. In order for a warrant to be classified in stockholders' equity, the warrant must be (a) indexed to the Company's equity and (b) meet the conditions for equity classification in Accounting Standards Codification ("ASC") Subtopic 815-40, Derivatives and Hedging-Contracts in an Entity's Own Equity. If a warrant does not meet the conditions for equity classification, it is carried in the condensed consolidated balance sheet as a warrant liability measured at fair value, with subsequent changes in the fair value of the warrant recorded in the condensed consolidated statements of comprehensive income as a non-operating expense. If a warrant meets both conditions for equity classification, the warrant is initially recorded in additional paid-in capital on the consolidated balance sheet, and the amount initially recorded is not subsequently remeasured at fair value.
Stock-Based Compensation	Stock-Based Compensation The Company accounts for share-based awards granted to employees and nonemployees under the fair value method prescribed by ASC Subtopic 718-10, Stock Compensation. Stock-based compensation cost is measured based on the estimated grant date fair value of the award and is recognized as expense over the requisite service period. The fair value of stock options is estimated using the Black Scholes option-pricing model. The Company accounts for forfeitures as they occur.
Earnings per Share	Earnings per share is computed by dividing net income or loss available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. The dilutive effect of these potential common shares is reflected in diluted earnings per share by application of the treasury stock method.
Risks and Uncertainties	Risks and Uncertainties COVID-19 has adversely impacted global supply chain and general economic conditions. The Company has experienced disruptions and higher costs in manufacturing, supply chain, logistical operations, and shortages of certain Company products in distribution channels. The full extent of the impact of the COVID-19 pandemic on the Company's business and operational and financial performance and condition is currently uncertain and will depend on many factors outside the Company's control, including but not limited to the timing, extent, duration and effects of the virus and any of its mutations, the utilization and effectiveness of treatments and vaccines, the imposition of effective public safety and other protective measures, the further impact of COVID-19 on the global economy and demand for the Company's products and services. Should the COVID-19 pandemic, including variants such as Delta, not improve or worsen, or if the Company's attempt to mitigate its impact on its supply chain, operations and costs is not successful, the Company's business, results of operations, financial condition and prospects may be adversely affected.
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimizes the use of unobservable inputs to the extent possible. The inputs used to measure fair value are prioritized based on a three-level hierarchy, which are defined as follows: Level 1 – Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2 – Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3 – Significant unobservable inputs that reflect a company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.
Derivative Financial Instruments	Derivative Financial Instruments The Company evaluates its financial instruments to determine if such instruments are derivatives or contain features that qualify as embedded derivatives in accordance with ASC Topic 815, “Derivatives and Hedging”. For derivative financial instruments that are accounted for as liabilities, the derivative instrument is initially recorded at its fair value on the grant date and is then re-valued at each reporting date, with changes in the fair value reported in the statements of operations. Derivative liabilities are classified on the balance sheet as current or non-current based on whether or not net-cash settlement or conversion of the instrument could be required within 12 months of the balance sheet date.
Recent Accounting Standards	Recent Accounting Pronouncements Accounting Standards Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The ASU is effective for the Company for annual reporting periods beginning after December 15, 2021 and interim periods therein, with early adoption permitted. The ASU will require lessees to report most leases as assets and liabilities on the balance sheet. The Company is currently evaluating the potential impact of adopting this guidance on its financial statements. In August 2018, the FASB issued ASU 2018-14, Compensation – Retirements Benefits – Defined Benefit Plans – General (Subtopic 715-20). The ASU is effective for the Company for annual reporting periods beginning after December 15, 2021 with early adoption permitted. This guidance should be applied on a retrospective basis to all periods presented. The ASU will update disclosure requirements for employers that sponsor defined benefit pension or other post retirement plans. The Company is currently evaluating the potential impact of adopting this guidance on its financial statements. In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (Topic 740) which is intended to simplify various aspects related to accounting for income taxes. This ASU is effective for the Company for annual reporting periods beginning after December 15, 2021 and interim periods therein, with early adoption permitted. The ASU removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The Company is currently evaluating the potential impact of adopting this guidance on its financial statements. In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848). The ASU provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. Adoption of the provisions of ASU 2020-04 are optional and are effective from March 12, 2020 through December 31, 2022. As of September 26, 2021, the Company did not adopt any expedients or exceptions under ASU 2020-04. The Company will continue to evaluate the impact of ASU 2020-04 and whether it will apply the optional expedients and exceptions. In August 2020, the FASB issued ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (Subtopic 470-20). The ASU is effective for the Company for annual reporting periods beginning after December 15, 2023 and interim periods therein, with early adoption permitted as of the beginning of the Company's annual fiscal year. The ASU includes amendments to the guidance on convertible instruments and the derivative scope exception for contracts in an entity’s own equity and simplifies the accounting for convertible instruments which include beneficial conversion features or cash conversion features by removing certain separation models in Subtopic 470-20. Additionally, the ASU requires entities to use the “if-converted” method when calculating diluted earnings per share for convertible instruments. The Company is currently evaluating the potential impact of adopting this guidance on its financial statements.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	9 Months Ended
	Sep. 26, 2021
Accounting Policies [Abstract]
Schedule of basic and diluted earnings per share	The following table sets forth the calculation of basic and diluted earnings per share: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Numerator: Net income $ ( 30,200 ) $ 13,543 $ ( 9,158 ) $ 30,904 Denominator: Weighted average common 106,285,072 67,673,884 80,735,661 67,673,884 Dilutive effect of potential common shares - - - - Weighted average common 106,285,072 67,673,884 80,735,661 67,673,884 Earnings per share: Basic $ ( 0.28 ) $ 0.20 $ ( 0.11 ) $ 0.46 Diluted $ ( 0.28 ) $ 0.20 $ ( 0.11 ) $ 0.46

BUSINESS COMBINATION AND ACQU_2

BUSINESS COMBINATION AND ACQUISITIONS (Tables)	9 Months Ended
	Sep. 26, 2021
Business Acquisition [Line Items]
Summary of reconciles elements of business combination to cash flows	The following table reconciles the elements of the Business Combination to the condensed consolidated statements of cash flows for the 39-week period ended September 26, 2021: Recapitalization Cash - Empower's trust and cash (net of redemptions of $ 99,353 and 44,314 ) $ 107,042 Cash - Forward Purchase Agreement 50,000 Cash - PIPE Financing 240,000 Net cash provided by Business Combination and PIPE Financing 397,042 Less: cash consideration paid to Holley Stockholder ( 264,718 ) Net contributions from Business Combination and PIPE Financing $ 132,324
Drake Automotive Group LLC [Member]
Business Acquisition [Line Items]
Summary of Purchase price allocation of assets acquired and liabilities assumed	The allocation of the purchase price to the assets acquired and liabilities assumed was based on estimates of the fair value of the net assets as follows: Cash $ 205 Accounts receivable 3,947 Inventory 14,198 Property, plant and equipment 1,296 Other assets 189 Tradenames 7,715 Customer relationships 17,175 Goodwill 7,551 Accounts payable ( 2,524 ) Accrued liabilities ( 648 ) $ 49,104
Simpson Performance Products, Inc. [Member]
Business Acquisition [Line Items]
Summary of Purchase price allocation of assets acquired and liabilities assumed	The allocation of the purchase price to the assets acquired and liabilities assumed was based on estimates of the fair value of the net assets as follows: November 16, 2020 (as initially reported) Measurement Period Adjustments November 16, 2020 (as adjusted) Cash $ 7,715 $ — $ 7,715 Accounts receivable 3,894 — 3,894 Inventory 19,265 ( 770 ) 18,495 Property, plant and equipment 5,952 — 5,952 Other assets 1,613 — 1,613 Tradenames 23,980 — 23,980 Customer relationships 28,770 — 28,770 Patents 2,720 — 2,720 Goodwill 51,305 843 52,148 Accounts payable ( 2,483 ) — ( 2,483 ) Accrued liabilities ( 7,787 ) — ( 7,787 ) Deferred tax liability ( 12,993 ) — ( 12,993 ) Debt ( 4,615 ) — ( 4,615 ) $ 117,336 $ 73 $ 117,409
Detroit Speed, Inc. [Member]
Business Acquisition [Line Items]
Summary of Purchase price allocation of assets acquired and liabilities assumed	The allocation of the purchase price to the assets acquired and liabilities assumed was based on estimates of the fair value of the net assets as follows: Cash $ 1,784 Accounts receivable 418 Inventory 3,478 Property, plant and equipment 3,040 Other assets 215 Tradenames 1,127 Customer relationships 560 Goodwill 2,636 Accounts payable ( 668 ) Accrued liabilities ( 1,019 ) Deferred tax liability ( 274 ) $ 11,297
Advance Engine Management Inc. [Member]
Business Acquisition [Line Items]
Summary of Purchase price allocation of assets acquired and liabilities assumed	The allocation of the purchase price to the assets acquired and liabilities assumed was based on estimates of the fair value of the net assets as follows: April 14, 2021 (as initially reported) Measurement Period Adjustments April 14, 2021 (as adjusted) Accounts receivable $ 3,454 $ ( 61 ) $ 3,393 Inventory 3,892 — 3,892 Property, plant and equipment 1,342 — 1,342 Other assets 493 ( 91 ) 402 Tradenames 10,760 — 10,760 Customer relationships 14,640 — 14,640 Patents 1,970 — 1,970 Technology intangibles 110 — 110 Goodwill 17,426 ( 420 ) 17,006 Accounts payable ( 2,032 ) 110 ( 1,922 ) Accrued liabilities ( 489 ) 139 ( 350 ) $ 51,566 $ ( 323 ) $ 51,243
Summary of pro forma information	The following table provides the unaudited consolidated pro forma results for the periods presented as if AEM had been acquired as of January 1, 2020. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Pro forma net sales $ 159,673 $ 140,195 $ 521,836 $ 384,237 Pro forma net income ( 30,200 ) 15,045 ( 6,906 ) 33,195

INVENTORY (Tables)

INVENTORY (Tables)	9 Months Ended
	Sep. 26, 2021
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories of the Company consisted of the following: September 26, December 31, 2021 2020 Raw materials $ 48,665 $ 44,474 Work-in-process 18,960 12,946 Finished goods 96,718 76,508 $ 164,343 $ 133,928

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT, NET (Tables)	9 Months Ended
	Sep. 26, 2021
Property, Plant and Equipment [Abstract]
Schedule of property, plant, and equipment	Property, plant and equipment of the Company consisted of the following: September 26, December 31, 2021 2020 Land $ 1,330 $ 1,330 Buildings and improvements 10,123 8,594 Machinery and equipment 47,042 44,690 Construction in process 17,906 8,088 Total property, plant and equipment 76,401 62,702 Less: accumulated depreciation 26,008 18,973 Property, plant and equipment, net $ 50,393 $ 43,729
Schedule of long-lived assets by geographic locations	The Company’s long-lived assets by geographic locations are as follows: September 26, December 31, 2021 2020 United States $ 48,359 $ 42,264 International 2,034 1,465 Total property, plant and equipment, net 50,393 43,729

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)	9 Months Ended
	Sep. 26, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Goodwill	The following presents changes to goodwill for the period indicated: For the thirty-nine weeks Balance at December 31, 2020 $ 359,099 Advance Engine Management acquisition 17,426 Classic Instruments acquisition 4,912 Measurement period adjustments* 423 Balance at September 26, 2021 $ 381,860
Summary Of Intangible Assets	Intangible assets consisted of the following: September 26, 2021 Gross Carrying Amount Accumulated Amortization Net Carrying Value Finite-lived intangible assets: Customer relationships $ 259,907 $ ( 29,878 ) $ 230,029 Tradenames 13,775 ( 3,906 ) 9,869 Technology 26,673 ( 8,469 ) 18,204 Total finite-lived intangible assets $ 300,355 $ ( 42,253 ) $ 258,102 Indefinite-lived intangible assets: Tradenames $ 163,768 — $ 163,768 December 31, 2020 Gross Carrying Amount Accumulated Amortization Net Carrying Value Finite-lived intangible assets: Customer relationships $ 245,274 $ ( 21,819 ) $ 223,455 Tradenames 13,775 ( 3,369 ) 10,406 Technology 24,595 ( 6,674 ) 17,921 Total finite-lived intangible assets $ 283,644 $ ( 31,862 ) $ 251,782 Indefinite-lived intangible assets: Tradenames $ 152,740 — $ 152,740
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The following outlines the estimated future amortization expense related to intangible assets held as of September 26, 2021: 2021 (excluding the thirty-nine weeks ended September 26, 2021) $ 3,573 2022 14,202 2023 14,039 2024 13,226 2025 13,189 Thereafter 199,873 Total $ 258,102

DEBT (Tables)

DEBT (Tables)	9 Months Ended
	Sep. 26, 2021
Debt Disclosure [Abstract]
Schedule of debt	Debt of the Company consisted of the following: September 26, December 31, 2021 2020 First lien note $ 539,202 $ 541,969 Second lien note 45,000 145,000 Other 4,320 4,701 Less unamortized debt issuance costs ( 12,600 ) ( 16,684 ) 575,922 674,986 Less current portion of long-term debt ( 5,528 ) ( 5,528 ) $ 570,394 $ 669,458
Future maturities of long-term debt and amortization of debt issuance cost	Future maturities of long-term debt and amortization of debt issuance costs as of September 26, 2021 are as follows: Debt Debt Issuance Costs 2021 (remaining three months) $ 2,765 $ 703 2022 5,528 2,899 2023 5,528 3,019 2024 5,528 3,148 2025 519,853 2,746 Thereafter 49,320 85 $ 588,522 $ 12,600

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	9 Months Ended
	Sep. 26, 2021
Fair Value Disclosures [Abstract]
Schedule of value assets and liabilities measured on recurring basis	The Company’s financial liabilities subject to fair value measurement on a recurring basis and the level of inputs used for such measurements were as follows: Fair Value Measured as of September 26, 2021 Level 1 Level 2 Level 3 Total Liabilities included in: Warrant liability (Public) $ 30,400 $ — $ — $ 30,400 Warrant liability (Private) — — 15,586 15,586 Acquisition contingent consideration — — 24,373 24,373 Earn-out liability — — 24,588 24,588 Total fair value $ 30,400 $ — $ 64,547 $ 94,947
Summary of Assumptions for Estimated Fair Value Using Monte Carlo Simulation Model	The fair value of private warrants was estimated as of September 26, 2021 using the Monte Carlo simulation model with the following assumptions: Valuation date price $ 12.21 Strike price $ 11.50 Remaining life 4.81 years Expected dividend $ - Risk-free interest rate 0.93 % Price threshold $ 18.00 The fair value of the earn-out liability was estimated as of September 26, 2021 using the Monte Carlo simulation model with the following assumptions: Valuation date price $ 12.21 Expected term 6.81 years Expected volatility 38.24 % Risk-free interest rate 1.25 % Price hurdle 1 $ 13.00 Price hurdle 2 $ 15.00
Reconciliation of changes	The reconciliation of changes in Level 3 during the 13-week and 39-week periods ended September 26, 2021 is as follows: For the thirty-nine weeks ended September 26, 2021 Private Warrants Acquisition Contingent Consideration Earn-Out Liability Total Balance on December 31, 2020 $ — $ 9,200 $ — $ 9,200 Cash paid for contingent consideration — ( 2,000 ) — ( 2,000 ) Liabilities assumed in recapitalization 9,613 — 17,722 27,335 Losses included in earnings 5,973 17,173 6,866 30,012 Balance on September 26, 2021 $ 15,586 $ 24,373 $ 24,588 $ 64,547

REVENUE (Tables)

REVENUE (Tables)	9 Months Ended
	Sep. 26, 2021
Revenue from Contract with Customer [Abstract]
Summary of Revenue by Product Category	The following table summarizes total revenue by product category: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Electronic systems $ 77,199 $ 70,371 $ 241,474 $ 197,493 Mechanical systems 37,026 29,383 118,295 85,218 Exhaust 16,971 18,905 59,587 53,062 Accessories 14,384 14,648 45,403 29,987 Safety 14,093 — 48,287 — Total sales $ 159,673 $ 133,307 $ 513,046 $ 365,760
Summary of Revenue Based on Geographic Location	The following table summarizes total revenue based on geographic location from which the product is shipped: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 United States $ 155,626 $ 133,307 $ 501,196 $ 365,760 Italy 4,047 — 11,850 — Total sales $ 159,673 $ 133,307 $ 513,046 $ 365,760

INCOME TAXES (Tables)

INCOME TAXES (Tables)	9 Months Ended
	Sep. 26, 2021
Income Tax Disclosure [Abstract]
Schedule of Provision and Effective tax rates	Significant judgment is required in determining the effective tax rate and in evaluating tax positions. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Income tax expense $ ( 3,301 ) $ 5,512 $ 7,255 $ 9,656 Effective tax rates 9.9 % 28.9 % nm 23.8 % nm - not meaningful

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	9 Months Ended
	Sep. 26, 2021
Earnings Per Share [Abstract]
Schedule of basic and diluted earnings per share	The following table sets forth the calculation of basic and diluted earnings per share: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Numerator: Net income $ ( 30,200 ) $ 13,543 $ ( 9,158 ) $ 30,904 Denominator: Weighted average common 106,285,072 67,673,884 80,735,661 67,673,884 Dilutive effect of potential common shares - - - - Weighted average common 106,285,072 67,673,884 80,735,661 67,673,884 Earnings per share: Basic $ ( 0.28 ) $ 0.20 $ ( 0.11 ) $ 0.46 Diluted $ ( 0.28 ) $ 0.20 $ ( 0.11 ) $ 0.46
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following outstanding shares of common stock equivalents were excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Anti-dilutive shares excluded Warrants 14,666,644 — 14,666,644 — Stock options 1,394,008 — 1,394,008 — Restricted stock units 658,891 — 658,891 — Earn-out shares 2,187,500 — 2,187,500 — Total anti-dilutive shares 18,907,043 — 18,907,043 —

BENEFIT PLANS (Tables)

BENEFIT PLANS (Tables)	9 Months Ended
	Sep. 26, 2021
Retirement Benefits [Abstract]
Summarizes the Components of Net Periodic Benefit Cost	The following summarizes the components of net periodic benefit cost for the defined benefit pension plan: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Components of Expense: Service cost $ 35 $ 40 $ 107 $ 120 Interest cost 38 48 114 144 Expected return on plan ( 58 ) ( 64 ) ( 180 ) ( 192 ) Amortization of net loss 9 — 19 — Net periodic benefit cost $ 24 $ 24 $ 60 $ 72

EQUITY-BASED COMPENSATION PLA_2

EQUITY-BASED COMPENSATION PLANS (Tables)	9 Months Ended
	Sep. 26, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Components of Equity-based compensation expense	Equity-based compensation expense included the following components: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Stock options $ 376 $ — $ 376 $ — Profit interest units 2,110 121 2,372 356
Schedule Of Share-Based Payment Award Stock Options Valuation using Black-Scholes option pricing model	The fair value of each stock option granted on July 16, 2021 was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions: Weighted-average expected term 6.0 Expected volatility 40.3 % Expected dividend $ — Risk-free interest rate 0.94 %

LEASE COMMITMENTS (Tables)

LEASE COMMITMENTS (Tables)	9 Months Ended
	Sep. 26, 2021
Lessee Disclosure [Abstract]
Schedule of Future Minimum Fixed Lease Obligations Under Operating Leases	The aggregate future minimum fixed lease obligations under operating leases for the Company as of September 26, 2021, are as follows: 2021 (excluding the thirty-nine weeks ended September 26, 2021) $ 1,705 2022 6,485 2023 5,036 2024 3,679 2025 2,752 Thereafter 11,045

Acquisition, restructuring an_2

Acquisition, restructuring and management fee costs (Tables)	9 Months Ended
	Sep. 26, 2021
Business Combination and Asset Acquisition [Abstract]
Summarizes of total acquisition, restructuring and management fee costs	The following table summarizes total acquisition, restructuring and management fee costs: For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Acquisitions (1) $ 204 $ 137 $ 3,415 $ 1,301 Restructuring (2) 140 955 1,265 4,323 Management fees (3) 23,274 894 25,813 2,665 Earn out adjustment (4) — — 17,173 — Total acquisition, restructuring $ 23,618 $ 1,986 $ 47,666 $ 8,289 (1) Includes professional fees for legal, accounting, consulting, administrative, and other professional services directly attributable to potential acquisitions. (2) Includes costs incurred as part of the restructuring of operations including professional and consulting services. (3) Includes acquisition costs and management fees paid to Sentinel Capital Partners, including a fee of $ 23,275 paid in the 13-week period ended September 26, 2021 upon the Closing of the Business Combination . (4) A fair value adjustment to the contingent consideration payable from the Simpson acquisition .

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	9 Months Ended
	Sep. 26, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Accrual For Product Warranties	The following table provides the changes in the Company's accrual for product warranties, which is classified as a component of accrued liabilities in the condensed consolidated balance sheets. For the thirteen weeks ended For the thirty-nine weeks ended September 26, 2021 September 27, 2020 September 26, 2021 September 27, 2020 Beginning balance $ 2,928 $ 2,962 $ 3,989 $ 3,454 Accrued for current year 2,027 3,710 5,462 7,637 Settlement of warranty claims ( 2,310 ) ( 3,176 ) ( 6,806 ) ( 7,595 ) Ending balance $ 2,645 $ 3,496 $ 2,645 $ 3,496

Description of Organization a_2

Description of Organization and Business Operations - Additional Information (Detail) - $ / shares	Sep. 26, 2021	Dec. 31, 2020
Description of Organization and Business Operations (Details) [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001

Summary of Significant Accoun_2

Summary of Significant Accounting Policies - Schedule of basic and diluted loss per common share (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 26, 2021	Jun. 27, 2021	Mar. 28, 2021	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Sep. 26, 2021	Sep. 27, 2020
Numerator:
Net Income (Loss) Attributable to Parent	$ (30,200)	$ 23,098	$ (2,056)	$ 13,543	$ 12,509	$ 4,852	$ (9,158)	$ 30,904
Denominator: Weighted Average
Weighted Average Number of Shares Outstanding, Basic and Diluted	106,285,072			67,673,884			80,735,661	67,673,884

Business Combination and Acqu_3

Business Combination and Acquisitions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands

Aug. 31, 2021

Jul. 16, 2021

May 24, 2021

Apr. 14, 2021

Dec. 18, 2020

Nov. 16, 2020

Nov. 11, 2020

Sep. 26, 2021

Mar. 28, 2021

Sep. 26, 2021

Oct. 09, 2021

Dec. 31, 2020

Business Acquisition [Line Items]

Common stock, share issued

115,805,639

115,805,639

67,673,884

Warrant price per share

$ 11.50

Purchase of warrants (in Shares)

1

Cash payment of business combination

$ 264,718

Transaction costs

$ 44,314

$ 44,314

IPO [Member]

Business Acquisition [Line Items]

Warrants expiration term

5 years

Warrant price per share

$ 11.50

Warrants Expire Date

Jul. 16, 2026

Public Warrants [Member] | IPO [Member]

Business Acquisition [Line Items]

Purchase of warrants (in Shares)

8,333,310

Private Placement Warrants [Member] | IPO [Member]

Business Acquisition [Line Items]

Purchase of warrants (in Shares)

4,666,667

A&R FPA

Business Acquisition [Line Items]

Proceeds from issuance of common stock

$ 50,000

Warrant price per share

$ 11.50

A&R FPA | Common Stock

Business Acquisition [Line Items]

Common stock, share issued

5,000,000

A&R FPA | Warrant

Business Acquisition [Line Items]

Purchase of warrants (in Shares)

1,666,667

Subscription Agreement [Member] | PIPE Investors

Business Acquisition [Line Items]

Common stock shares subscribed but not issued

24,000,000

Sale of stock issue price per share

$ 10

Common stock shares subscribed but not issued value

$ 240,000

Empower Sponsor Holdings LLC [Member] | Merger Agreement

Business Acquisition [Line Items]

Business combination contingent consideration shares issuable

2,187,500

Drake Automotive Group LLC [Member]

Business Acquisition [Line Items]

Date of acquisitions

Nov. 11, 2020

Business combination purchase price

$ 49,104

Business combination ownership acquired

100.00%

Cash payment of business combination

$ 47,104

Business combination earn out payment

2,000

Business acquisition intangible assets including goodwill acquired

32,441

Business combination additional potential consideration payment

2,000

Fair value of additional payment

$ 2,000

Drake Automotive Group LLC [Member] | Customer Relationships [Member]

Business Acquisition [Line Items]

Intangible assets useful life

20 years

Accounts Receivable Acquired

$ 4,155

Simpson Performance Products, Inc. [Member]

Business Acquisition [Line Items]

Date of acquisitions

Nov. 16, 2020

Business combination purchase price

$ 117,409

Business combination ownership acquired

100.00%

Cash payment of business combination

$ 110,209

Business combination earn out payment

7,200

Business acquisition intangible assets including goodwill acquired

107,618

Business combination additional potential consideration payment

25,000

Fair value of additional payment

7,200

$ 24,373

Business combination contingent consideration adjustment

$ 17,173

Accounts Receivable Acquired

$ 3,894

Simpson Performance Products, Inc. [Member] | Customer Relationships [Member]

Business Acquisition [Line Items]

Intangible assets useful life

20 years

Simpson Performance Products, Inc. [Member] | Patents [Member]

Business Acquisition [Line Items]

Intangible assets useful life

10 years

Detroit Speed, Inc. [Member]

Business Acquisition [Line Items]

Date of acquisitions

Dec. 18, 2020

Business combination purchase price

$ 11,297

Cash payment of business combination

9,297

Unit issued for business combination

2,000

Business acquisition intangible assets including goodwill acquired

4,323

Accounts Receivable Acquired

$ 418

Detroit Speed, Inc. [Member] | Customer Relationships [Member]

Business Acquisition [Line Items]

Intangible assets useful life

10 years

Advance Engine Management Inc. [Member]

Business Acquisition [Line Items]

Date of acquisitions

Apr. 14, 2021

Cash payment of business combination

$ 51,243

Business acquisition intangible assets including goodwill acquired

44,906

Net sales

5,904

$ 11,341

Net income

896

1,583

Business combination transaction costs expensed

$ 46

$ 2,251

Accounts Receivable Acquired

$ 3,454

Advance Engine Management Inc. [Member] | Customer Relationships [Member]

Business Acquisition [Line Items]

Intangible assets useful life

20 years

Advance Engine Management Inc. [Member] | Patents [Member]

Business Acquisition [Line Items]

Intangible assets useful life

13 years

Finspeed LLC [Member]

Business Acquisition [Line Items]

Date of acquisitions

May 24, 2021

Cash payment of business combination

$ 2,505

Business combination intangible assets

$ 268

Classic Instruments LLC [Member]

Business Acquisition [Line Items]

Date of acquisitions

Aug. 31, 2021

Cash payment of business combination

$ 6,120

Business acquisition intangible assets including goodwill acquired

$ 4,912

Holley Parent Holdings LLC | Merger Agreement

Business Acquisition [Line Items]

Common stock, share issued

67,673,884

Sale of stock issue price per share

$ 10

Cash payment of business combination

$ 264,718

Business Combination and Acqu_4

Business Combination and Acquisitions - Summary of reconciles elements of business combination to cash flows (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2021USD ($)
Business Acquisition [Line Items]
Cash - Empowers trust and cash (net of redemptions of $99,353 and transaction costs of $44,314)	$ 107,042
Cash - Forward Purchase Agreement	50,000
Cash - PIPE Financing	240,000
Net cash provided by Business Combination and PIPE Financing	397,042
Less: cash consideration paid to Holley Stockholder	264,718
Net contributions from Business Combination and PIPE Financing	$ 132,324

Business Combination and Acqu_5

Business Combination and Acquisitions - Summary of reconciles elements of business combination to cash flows (Parenthetical) (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2021USD ($)
Business Acquisition [Line Items]
Empowers trust and cash redemptions	$ 99,353
Transaction costs	$ 44,314

Business Combination and Acqu_6

Business Combination and Acquisitions - Summary of Purchase price allocation of assets acquired and liabilities assumed (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Apr. 14, 2021	Dec. 31, 2020	Dec. 18, 2020	Nov. 16, 2020	Nov. 11, 2020
Business Acquisition [Line Items]
Goodwill	$ 381,860		$ 359,099
Drake Automotive Group LLC [Member]
Business Acquisition [Line Items]
Cash						$ 205
Accounts receivable						3,947
Inventory						14,198
Property, plant and equipment						1,296
Other assets						189
Goodwill						7,551
Accounts payable						(2,524)
Accrued liabilities						648
Net assets acquired and liabilities assumed						49,104
Drake Automotive Group LLC [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets						17,175
Drake Automotive Group LLC [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets						$ 7,715
Simpson Performance Products, Inc. [Member]
Business Acquisition [Line Items]
Cash					$ 7,715
Accounts receivable					3,894
Inventory					18,495
Property, plant and equipment					5,952
Other assets					1,613
Goodwill					52,148
Accounts payable					(2,483)
Accrued liabilities					7,787
Deferred tax liabilities					12,993
Debt					(4,615)
Net assets acquired and liabilities assumed					117,409
Simpson Performance Products, Inc. [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Cash					7,715
Accounts receivable					3,894
Inventory					19,265
Property, plant and equipment					5,952
Other assets					1,613
Goodwill					51,305
Accounts payable					(2,483)
Accrued liabilities					7,787
Deferred tax liabilities					12,993
Debt					(4,615)
Net assets acquired and liabilities assumed					117,336
Simpson Performance Products, Inc. [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Cash					0
Accounts receivable					0
Inventory					(770)
Property, plant and equipment					0
Other assets					0
Goodwill					843
Accounts payable					0
Accrued liabilities					0
Deferred tax liabilities					0
Debt					0
Net assets acquired and liabilities assumed					73
Simpson Performance Products, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets					28,770
Simpson Performance Products, Inc. [Member] | Customer Relationships [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Intangible assets					28,770
Simpson Performance Products, Inc. [Member] | Customer Relationships [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Intangible assets					0
Simpson Performance Products, Inc. [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets					23,980
Simpson Performance Products, Inc. [Member] | Trade Names [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Intangible assets					23,980
Simpson Performance Products, Inc. [Member] | Trade Names [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Intangible assets					0
Simpson Performance Products, Inc. [Member] | Patents [Member]
Business Acquisition [Line Items]
Intangible assets					2,720
Simpson Performance Products, Inc. [Member] | Patents [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Intangible assets					2,720
Simpson Performance Products, Inc. [Member] | Patents [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Intangible assets					$ 0
Detroit Speed, Inc. [Member]
Business Acquisition [Line Items]
Cash				$ 1,784
Accounts receivable				418
Inventory				3,478
Property, plant and equipment				3,040
Other assets				215
Goodwill				2,636
Accounts payable				(668)
Accrued liabilities				1,019
Deferred tax liabilities				274
Net assets acquired and liabilities assumed				11,297
Detroit Speed, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets				560
Detroit Speed, Inc. [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets				$ 1,127
Advance Engine Management Inc. [Member]
Business Acquisition [Line Items]
Accounts receivable		$ 3,393
Inventory		3,892
Property, plant and equipment		1,342
Other assets		402
Goodwill		17,006
Accounts payable		(1,922)
Accrued liabilities		350
Net assets acquired and liabilities assumed		51,243
Advance Engine Management Inc. [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Accounts receivable		3,454
Inventory		3,892
Property, plant and equipment		1,342
Other assets		493
Goodwill		17,426
Accounts payable		(2,032)
Accrued liabilities		489
Net assets acquired and liabilities assumed		51,566
Advance Engine Management Inc. [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Accounts receivable		(61)
Inventory		0
Property, plant and equipment		0
Other assets		(91)
Goodwill		(420)
Accounts payable		(110)
Accrued liabilities		139
Net assets acquired and liabilities assumed		(323)
Advance Engine Management Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets		14,640
Advance Engine Management Inc. [Member] | Customer Relationships [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Intangible assets		14,640
Advance Engine Management Inc. [Member] | Customer Relationships [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Intangible assets		0
Advance Engine Management Inc. [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets		10,760
Advance Engine Management Inc. [Member] | Trade Names [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Intangible assets		10,760
Advance Engine Management Inc. [Member] | Trade Names [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Intangible assets		0
Advance Engine Management Inc. [Member] | Patents [Member]
Business Acquisition [Line Items]
Intangible assets		1,970
Advance Engine Management Inc. [Member] | Patents [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Intangible assets		1,970
Advance Engine Management Inc. [Member] | Patents [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Intangible assets		0
Advance Engine Management Inc. [Member] | Technology Intangible [Member]
Business Acquisition [Line Items]
Intangible assets		110
Advance Engine Management Inc. [Member] | Technology Intangible [Member] | Previously Reported [Member]
Business Acquisition [Line Items]
Intangible assets		110
Advance Engine Management Inc. [Member] | Technology Intangible [Member] | Revision of Prior Period, Adjustment [Member]
Business Acquisition [Line Items]
Intangible assets		$ 0

Business Combination and Acqu_7

Business Combination and Acquisitions - Summary of pro forma information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Business Acquisition [Line Items]
Pro forma net sales	$ 159,673	$ 140,195	$ 521,836	$ 384,237
Pro forma net income	$ (30,200)	$ 15,045	$ (6,906)	$ 33,195

INVENTORY - Schedule of Invento

INVENTORY - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 48,665	$ 44,474
Work-in-process	18,960	12,946
Finished goods	96,718	76,508
Inventory, Net, Total	$ 164,343	$ 133,928

Property, Plant and Equipment_3

Property, Plant and Equipment, net - Schedule of property, plant, and equipment (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 76,401	$ 62,702
Less: accumulated depreciation	26,008	18,973
Property, Plant and Equipment, Net, Total	50,393	43,729
Land [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,330	1,330
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	10,123	8,594
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	47,042	44,690
Construction in process [Member]
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 17,906	$ 8,088

Property, Plant and Equipment_4

Property, Plant and Equipment, net - Schedule of long-lived assets by geographic locations (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, net	$ 50,393	$ 43,729
United States [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, net	48,359	42,264
International [member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, net	$ 2,034	$ 1,465

Goodwill And Other Intangible_3

Goodwill And Other Intangible Assets - Schedule of Change in the Carrying Amount of Goodwill (Details) (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2021USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Beginning Balance	$ 359,099
Goodwill, Ending Balance	381,860
Advance Engine Management Acquisition [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	17,426
Classic Instrument Acquisition [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	4,912
Simpson Performance Product Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Measurement period adjustments	$ 423	[1]
[1]	See Note 2, " Business Combination and Acquisitions - Simpson Performance Products, Inc. and Advance Engine Management Inc. "

Goodwill And Other Intangible_4

Goodwill And Other Intangible Assets - Summary Of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Finite-lived intangible assets:
Finite-Lived intangible assets, Gross Carrying Amount	$ 300,355	$ 283,644
Finite-Lived intangible assets, Accumulated Amortization	(42,253)	(31,862)
Finite-Lived intangible assets, Net Carrying Value	258,102	251,782
Customer Relationships [Member]
Finite-lived intangible assets:
Finite-Lived intangible assets, Gross Carrying Amount	259,907	245,274
Finite-Lived intangible assets, Accumulated Amortization	(29,878)	(21,819)
Finite-Lived intangible assets, Net Carrying Value	230,029	223,455
Trade Names [Member]
Finite-lived intangible assets:
Finite-Lived intangible assets, Gross Carrying Amount	13,775	13,775
Finite-Lived intangible assets, Accumulated Amortization	(3,906)	(3,369)
Finite-Lived intangible assets, Net Carrying Value	9,869	10,406
Indefinite-lived intangible assets:
Indefinite-lived intangible assets, Gross Carrying Amount	163,768	152,740
Indefinite-lived intangible assets, Net Carrying Value	163,768	152,740
Technology [Member]
Finite-lived intangible assets:
Finite-Lived intangible assets, Gross Carrying Amount	26,673	24,595
Finite-Lived intangible assets, Accumulated Amortization	(8,469)	(6,674)
Finite-Lived intangible assets, Net Carrying Value	$ 18,204	$ 17,921

Goodwill And Other Intangible_5

Goodwill And Other Intangible Assets - Schedule of Estimated Annual Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
2021 (excluding the thirty-nine weeks ended September 26, 2021)	$ 3,573
2022	14,202
2023	14,039
2024	13,226
2025	13,189
Thereafter	199,873
Finite-Lived intangible assets, Net Carrying Value	$ 258,102	$ 251,782

Debt - Schedule of debt (Detail

Debt - Schedule of debt (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Long-term Debt, Gross	$ 575,922	$ 674,986
Other	4,320	4,701
Less unamortized debt issuance costs	(12,600)	(16,684)
Less current portion of long-term debt	(5,528)	(5,528)
Long Term Debt Including Related Parties Noncurrent	570,394	669,458
First Lien Note [Member]
Line of Credit Facility [Line Items]
Long-term Debt, Gross	539,202	541,969
Second Lien Note [Member]
Line of Credit Facility [Line Items]
Long-term Debt, Gross	$ 45,000	$ 145,000

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($)	Jul. 16, 2021	Sep. 26, 2021	Sep. 26, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Long-term Debt, Gross		$ 575,922,000	$ 575,922,000	$ 674,986,000
Loss on early extinguishment of debt		(1,425,000)	$ (1,425,000)
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Maturity			2023-10
Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Maturity			2025-10
First Lien Note [Member]
Line of Credit Facility [Line Items]
Debt Instrument Face Amount		600,000,000	$ 600,000,000
Long-term Debt, Gross		539,202,000	539,202,000	541,969,000
Principal payment			1,382,000
Total outstanding letters of credit		1,200,000	1,200,000	1,200,000
First Lien Note [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument Face Amount		550,000,000	550,000,000
Second Lien Note [Member]
Line of Credit Facility [Line Items]
Debt Instrument Face Amount		145,000,000	145,000,000
Long-term Debt, Gross		45,000,000	45,000,000	145,000,000
Repayment of outstanding principal	$ 100,000,000
Loss on early extinguishment of debt	$ 1,425,000
Second Lien Note [Member] | Sentinel Capital Partners Junior Fund I [Member]
Line of Credit Facility [Line Items]
Amount outstanding, related party		$ 6,207,000	$ 6,207,000	$ 20,000,000
LIBOR [Member] | First Lien Note [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		5.10%	5.10%	5.20%
LIBOR [Member] | First Lien Note [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowings		$ 50,000,000	$ 50,000,000
LIBOR [Member] | Second Lien Note [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		8.50%	8.50%	8.70%
Prime Rate [Member]
Line of Credit Facility [Line Items]
Long-term Debt, Gross		$ 0	$ 0	$ 0

Debt - Future maturities of lon

Debt - Future maturities of long-term debt and amortization of debt issuance cost (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
2021 (remaining three months)	$ 2,765
2022	5,528
2023	5,528
2024	5,528
2025	519,853
Thereafter	49,320
Long-term Debt, Total	588,522
Debt Issuance Costs, Net [Abstract]
2021 (remaining three months)	703
2022	2,899
2023	3,019
2024	3,148
2025	2,746
Thereafter	85
Debt Issuance Costs	$ 12,600	$ 16,684

Lease Commitments - - Schedule

Lease Commitments - - Schedule of Future Minimum Fixed Lease Obligations Under Operating Leases (Details) $ in Thousands	Sep. 26, 2021USD ($)
Lessee Disclosure [Abstract]
2021 (excluding the thirty-nine weeks ended September 26, 2021)	$ 1,705
2022	6,485
2023	5,036
2024	3,679
2025	2,752
Thereafter	$ 11,045

Lease Commitments - Additional

Lease Commitments - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Lessee, Lease, Description [Line Items]
Rent expense	$ 1,992	$ 968	$ 5,665	$ 3,337
Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years		10 years
Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year		1 year

Private Placement (Detail)

Private Placement (Detail)	Oct. 09, 2021$ / sharesshares
Private Placement (Details) [Line Items]
Purchase of warrants (in Shares) | shares	1
Warrant price per share | $ / shares	$ 11.50

Related Party Transactions (Det

Related Party Transactions (Detail) - Subscription Agreement [Member] - PIPE Investors [Member] $ / shares in Units, $ in Thousands	Jul. 16, 2021USD ($)$ / sharesshares
Related Party Transactions (Details) [Line Items]
Common stock shares subscribed but not issued | shares	24,000,000
Sale of Stock, Price Per Share | $ / shares	$ 10
Common stock shares subscribed but not issued value | $	$ 240,000

Business Combination (Detail)

Business Combination (Detail) - USD ($) $ / shares in Units, $ in Thousands	Sep. 26, 2021	Jul. 16, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share	$ 0.0001		$ 0.0001
Merger Agreement [Member] | Holley Parent Holdings LLC [Member]
Business Acquisition [Line Items]
Sale of Stock, Price Per Share		$ 10
Subscription Agreement [Member] | PIPE Investors [Member]
Business Acquisition [Line Items]
Common stock shares subscribed but not issued		24,000,000
Sale of Stock, Price Per Share		$ 10
Common stock shares subscribed but not issued value		$ 240,000

Common Stock Warrants (Detail)

Common Stock Warrants (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 26, 2021	Sep. 26, 2021	Oct. 09, 2021	Dec. 31, 2020
Class of warrant or right outstanding			14,666,644
Common stock, par value (in Dollars per share)	$ 0.0001	$ 0.0001		$ 0.0001
Warrant entitlement, start date		Oct. 9, 2021
Class of warrant or right, number of securities called by each warrant or right			1
Warrant expiry date		Jul. 16, 2026
Warrant price per share			$ 11.50
Change in fair value of warrant liability	$ 17,273	$ 17,273
Warrant Liability	$ 45,986	$ 45,986
Public Warrants [Member] | Share Price $18.00 [Member]
Warrant price per share	$ 0.01	$ 0.01
Common stock, share price	18	$ 18
Warrants for redemption, description		The Company may redeem the Public Warrants at a price of $0.01 per warrant upon 30 days' notice if the closing price of the Company’s common stock equals or exceeds $18.00 per share, subject to adjustments, on the trading day prior to the date on which notice of redemption is given, provided there is an effective registration statement and current prospectus in effect with respect to the ordinary shares underlying such Warrants throughout the 30-day redemption period. If the foregoing conditions are satisfied and the Company issues a notice of redemption of the Warrants, the Warrant holder is entitled to exercise his, her or its Warrant prior to the scheduled redemption date. Any such exercise requires the Warrant holder to pay the exercise price for each Warrant being exercised.
Public Warrants [Member] | Share Price $10.00 [Member]
Warrant price per share	0.10	$ 0.10
Common stock, share price	$ 10	$ 10
Warrants for redemption, description		the Company may redeem the Public Warrants at a price of $0.10 per warrant upon 30 days' notice if the closing price of the Company’s common stock equals or exceeds $10.00 per share, subject to adjustments, on the trading day prior to the date on which notice of redemption is given. Beginning on the date the notice of redemption is given until the Warrants are redeemed or exercised, holders may elect to exercise their Warrants on a cashless basis and receive that number of shares of the Company’s common stock as determined by reference to a table in the warrant agreement.
Warrant [Member]
Change in fair value of warrant liability	$ 17,273
Warrant Liability	$ 45,986	$ 45,986
Common Stock [Member] | Private Warrants [Member]
Class of warrant or right outstanding			4,666,667
Common Stock [Member] | Public Warrants [Member]
Class of warrant or right outstanding			9,999,977

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of value assets and liabilities measured on recurring basis (Detail) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	$ 94,947
Acquisition Contingent Consideration Payable
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	24,373
Earn-Out Liability
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	24,588
Warrant Liability – Public Warrants [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	30,400
Warrant Liability Private Placement Warrants [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	15,586
Level 1 [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	30,400
Level 1 [Member] | Acquisition Contingent Consideration Payable
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 1 [Member] | Earn-Out Liability
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 1 [Member] | Warrant Liability – Public Warrants [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	30,400
Level 1 [Member] | Warrant Liability Private Placement Warrants [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 2 [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 2 [Member] | Acquisition Contingent Consideration Payable
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 2 [Member] | Earn-Out Liability
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 2 [Member] | Warrant Liability – Public Warrants [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 2 [Member] | Warrant Liability Private Placement Warrants [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 3 [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	64,547	$ 9,200
Level 3 [Member] | Acquisition Contingent Consideration Payable
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	24,373
Level 3 [Member] | Earn-Out Liability
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	24,588	$ 0
Level 3 [Member] | Warrant Liability – Public Warrants [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	0
Level 3 [Member] | Warrant Liability Private Placement Warrants [Member]
Fair Value Measurements (Details) - Schedule of value assets measured on recurring basis [Line Items]
Total fair value	$ 15,586

Fair Value Measurements - Summa

Fair Value Measurements - Summary of key inputs into the monte carlo simulation model (Details) - Monte Carlo Simulation Model [Member]	Sep. 26, 2021USD ($)yr
Earn Out Liability [Member] | Valuation date price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	12.21
Earn Out Liability [Member] | Expected term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input | yr	6.81
Earn Out Liability [Member] | Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	0.3824
Earn Out Liability [Member] | Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	0.0125
Earn Out Liability [Member] | Price Hurdle 1 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	13
Earn Out Liability [Member] | Price Hurdle 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	15
Private Warrants [Member | Valuation date price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	12.21
Private Warrants [Member | Strike price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	11.50
Private Warrants [Member | Expected term
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input | yr	4.81
Private Warrants [Member | Expected dividend
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input
Private Warrants [Member | Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	0.0093
Private Warrants [Member | Price threshold
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Alternative Investment, Measurement Input	18

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Fair Value Changes (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2021USD ($)
Fair Value Liabilities Measured On Recurring Basis [Line Items]
Ending Balance	$ 94,947
Earn Out Liability [Member]
Fair Value Liabilities Measured On Recurring Basis [Line Items]
Ending Balance	24,588
Fair Value, Inputs, Level 3 [Member]
Fair Value Liabilities Measured On Recurring Basis [Line Items]
Beginning balance	9,200
Cash paid for contingent consideration	(2,000)
Liabilities Assumed	27,335
Losses included in earnings	30,012
Ending Balance	64,547
Fair Value, Inputs, Level 3 [Member] | Acquisition Contingent Consideration [Member]
Fair Value Liabilities Measured On Recurring Basis [Line Items]
Beginning balance	9,200
Cash paid for contingent consideration	(2,000)
Liabilities Assumed	0
Losses included in earnings	17,173
Ending Balance	24,373
Fair Value, Inputs, Level 3 [Member] | Private Warrants [Member]
Fair Value Liabilities Measured On Recurring Basis [Line Items]
Beginning balance	0
Cash paid for contingent consideration	0
Liabilities Assumed	9,613
Losses included in earnings	5,973
Ending Balance	15,586
Fair Value, Inputs, Level 3 [Member] | Earn Out Liability [Member]
Fair Value Liabilities Measured On Recurring Basis [Line Items]
Beginning balance	0
Cash paid for contingent consideration	0
Liabilities Assumed	17,722
Losses included in earnings	6,866
Ending Balance	$ 24,588

Revenue - Summary of Revenue By

Revenue - Summary of Revenue By Product and Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Disaggregation of Revenue [Line Items]
Total sales	$ 159,673	$ 133,307	$ 513,046	$ 365,760
Electronic Systems [Member]
Disaggregation of Revenue [Line Items]
Total sales	77,199	70,371	241,474	197,493
Mechanical System [Member]
Disaggregation of Revenue [Line Items]
Total sales	37,026	29,383	118,295	85,218
Exhaust [Member]
Disaggregation of Revenue [Line Items]
Total sales	16,971	18,905	59,587	53,062
Accessories [Member]
Disaggregation of Revenue [Line Items]
Total sales	14,384	14,648	45,403	29,987
Safety [Member]
Disaggregation of Revenue [Line Items]
Total sales	$ 14,093		$ 48,287

Revenue - Summary of Revenue _2

Revenue - Summary of Revenue By Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Disaggregation of Revenue [Line Items]
Total sales	$ 159,673	$ 133,307	$ 513,046	$ 365,760
United States [Member]
Disaggregation of Revenue [Line Items]
Total sales	155,626	133,307	501,196	365,760
Italy [Member]
Disaggregation of Revenue [Line Items]
Total sales	$ 4,047		$ 11,850

INCOME TAXES - Schedule of Prov

INCOME TAXES - Schedule of Provision and Effective tax rates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ (3,301)	$ 5,512	$ 7,255	$ 9,656
Effective tax rates	9.90%	28.90%		23.80%

INCOME TAXES (Additional Inform

INCOME TAXES (Additional Information) (Details)	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 27, 2020
Income Tax Disclosure [Abstract]
Effective tax rates	9.90%	28.90%	23.80%
Federal tax rates	21.00%		21.00%

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 26, 2021	Jun. 27, 2021	Mar. 28, 2021	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Sep. 26, 2021	Sep. 27, 2020
Numerator:
Net income	$ (30,200)	$ 23,098	$ (2,056)	$ 13,543	$ 12,509	$ 4,852	$ (9,158)	$ 30,904
Denominator:
Weighted average common shares	106,285,072			67,673,884			80,735,661	67,673,884
Dilutive effect of potential common shares	$ 0			$ 0			$ 0	$ 0
Weighted average common shares assuming dilution	106,285,072			67,673,884			80,735,661	67,673,884
Earnings Per Share, Basic and Diluted [Abstract]
Basic	$ (0.28)			$ 0.20			$ (0.11)	$ 0.46
Diluted	$ (0.28)			$ 0.20			$ (0.11)	$ 0.46

Earnings Per Share - Schedule_2

Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares	18,907,043		18,907,043
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares	1,394,008		1,394,008
Restricted stock units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares	658,891		658,891
Earn-out shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares	2,187,500		2,187,500
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares	14,666,644		14,666,644

Benefit Plans - Summarizes The

Benefit Plans - Summarizes The Components Of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 35	$ 40	$ 107	$ 120
Interest cost	38	48	114	144
Expected return on plan assets	(58)	(64)	(180)	(192)
Amortization of net loss	9		19
Net periodic benefit cost	$ 24	$ 24	$ 60	$ 72

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Defined contribution pension plan
Defined benefit plan, contributions by employer	$ 300	$ 294	$ 417	$ 477
401(k) [Member]
Defined contribution pension plan
Matching contribution	$ 1,019	$ 757	$ 2,020	$ 1,558

Equity-based Compensation Pla_3

Equity-based Compensation Plans - (Additional Information) (Details) - USD ($)	Sep. 23, 2021	Jul. 16, 2021	Sep. 26, 2021	Sep. 26, 2021	Sep. 27, 2020
2021 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized			8,850,000	8,850,000
Common Stock, Capital Shares Reserved for Future Issuance			6,797,101	6,797,101
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period	658,891
Expiration period			10 years
Weighted average grant date fair value			$ 12.06
Unrecognized compensation cost			$ 7,946	$ 7,946
Remaining weighted average period			2 years 6 months
Restricted stock units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period			3 years
Restricted stock units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period			1 year
Profit Interest Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period				8,445	5,932
Shares vested				2,169	1,228
Shares Unvested			36,045	36,045	4,507
Weighted average grant date fair value, options non-vested			$ 0.64	$ 0.64	$ 0.27
Weighted average exercise price			$ 0.64	$ 0.64	$ 0.27
Unrecognized compensation cost			$ 15,999	$ 15,999
Total grant date fair value				$ 2,110	$ 356
Remaining weighted average period				1 year 10 months 24 days
Forfeited				2,614
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period		1,394,008
Expiration period			10 years
Weighted average grant date fair value, options non-vested			$ 3.88	$ 3.88
Weighted average exercise price			$ 3.88	$ 3.88
Unrecognized compensation cost			$ 5,033	$ 5,033
Remaining weighted average period			2 years 9 months 18 days
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period				3 years

Equity-based Compensation Pla_4

Equity-based Compensation Plans - Equity-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 26, 2021	Jun. 27, 2021	Mar. 28, 2021	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Sep. 26, 2021	Sep. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 2,486	$ 131	$ 131	$ 121	$ 114	$ 121
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	376						$ 376
Profit Interest Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 2,110			$ 121			$ 2,372	$ 356

Equity-based Compensation Pla_5

Equity-based Compensation Plans - Schedule Of Stock Options Valuation using Black-Scholes option pricing model (Details)	3 Months Ended
	Sep. 26, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Expected Term	6 years
Expected volatility	40.30%
Expected dividend	0.00%
Risk Free Interest Rate	0.94%

Acquisition, restructuring an_3

Acquisition, restructuring and management fee costs - Summary of total acquisition, restructuring and management fee costs (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 26, 2021	Sep. 27, 2020	Mar. 29, 2020	Sep. 26, 2021		Sep. 27, 2020
Business Combination and Asset Acquisition [Abstract]
Acquisitions	[1]	$ 204	$ 137		$ 3,415		$ 1,301
Restructuring	[2]	140	955	$ 4,323	1,265
Management fees	[3]	23,274	894	2,665	25,813
Earn out adjustment					17,173	[4]
Total acquisition, restructuring and management fees		$ 23,618	$ 1,986	$ 8,289	$ 47,666
[1]	Includes professional fees for legal, accounting, consulting, administrative, and other professional services directly attributable to potential acquisitions.
[2]	Includes costs incurred as part of the restructuring of operations including professional and consulting services.
[3]	Includes acquisition costs and management fees paid to Sentinel Capital Partners, including a fee of $ 23,275 paid in the 13-week period ended September 26, 2021 upon the Closing of the Business Combination
[4]	A fair value adjustment to the contingent consideration payable from the Simpson acquisition

Acquisition, restructuring an_4

Acquisition, restructuring and management fee costs (Additional Information) (Details) $ in Thousands	3 Months Ended
	Sep. 26, 2021USD ($)
Sentinel Capital Partners [Member]
Business Acquisition [Line Items]
Aacquisition costs and management fees	$ 23,275

COMMITMENTS AND CONTINGENCIES -

COMMITMENTS AND CONTINGENCIES - Schedule of Accrual For Product Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 2,928	$ 2,962	$ 3,989	$ 3,454
Accrued for current year warranty claims	2,027	3,710	5,462	7,637
Settlement of warranty claims	(2,310)	(3,176)	(6,806)	(7,595)
Ending Balance	$ 2,645	$ 3,496	$ 2,645	$ 3,496