EXHIBIT 5.1 FORM OF LEGAL OPINION

Asia Automotive Acquisition Corp.
199 Pierce St.
Suite 202
Birmingham, Michigan
U.S.A.

March 27, 2008

Dear Sirs

TONGXIN INTERNATIONAL LTD. (THE "COMPANY")

We are lawyers licensed and qualified to practice law in the British Virgin
Islands. We have been asked to provide this legal opinion in connection with
the issuance of the following securities (among others), as registered under the
United States Securities Act of 1933, as amended, (the "Securities Act"),
pursuant to the Registration statement, as amended, on Form S-4, Number
333-147086 provided to us (the "Registration Statement") as filed by the Company
with the United States Securities and Exchange Commission ("SEC"):

the issuance to the security holders of Asia Automotive Acquisition Corp., a
Delaware Corporation ("AAAC"), pursuant to a merger of AAAC with and into the
Company, of:

        (i)    up to a total of 5,031,250 units ("THE UNITS"), with each unit
               consisting of one Ordinary Share and one Warrant (as defined
               below);

        (ii)   one representative unit purchase option to purchase up to 350,000
               Units to the holder of one representative unit purchase option in
               AAAC (the "AAAC PURCHASE OPTION UNIT");

        (iii)  up to a total of 12,111,500 Ordinary Shares, comprised of
               (a) 6,380,000 Ordinary Shares to the holders of AAAC common stock
               (including 5,031,250 shares of common stock that have issued as
               part of the Units), in exchange for such stock, (b) 5,031,250
               Ordinary Shares issuable upon exercise of the Warrants included
               in the Units, (c) 350,000 Ordinary Shares issuable upon exercise
               of the Warrants included in the Purchase Option Unit; and

        (iv)   up to a total of 5,031,600 warrants to purchase one Ordinary
               Share (the "WARRANTS") comprised of (a) 5,031,250 Warrants to the
               holders of warrants in AAAC, as detailed in the Registration
               Statement) that were included in the Units, and (b) 350,000
               Warrants issuable upon exercise of the Purchase Option Unit.

This opinion is given in accordance with the terms of the Legal Matters section
of the Registration Statement (as defined below).

2     DOCUMENTS REVIEWED

We have reviewed originals, copies, drafts or conformed copies of the following
documents:

2.1    The written resolutions of the board of directors of the Company
       dated March 6, 2008, and the written resolutions of the sole shareholder
       of the Company dated March 6, 2008 (the "RESOLUTIONS").




2.2    A registered agent's certificate of incumbency dated March 6, 2008,
       issued by Maples Finance BVI Limited, the Company's registered agent, (a
       copy of which is attached as Annexure A) (the "REGISTERED AGENT'S
       CERTIFICATE").


2.3    The public records of the Company on file and available for public
       inspection at the Registry of Corporate Affairs in the British Virgin
       Islands (the "REGISTRY OF CORPORATE AFFAIRS") on March 7, 2008 including:

       (a)   the Company's Certificate of Incorporation;  and

       (b)   the Company's Memorandum and Articles of Association.

2.4    A certificate from a Director of the Company (a copy of which is
       annexed hereto as Annexure B) (the "DIRECTOR'S CERTIFICATE").

2.5    The Registration Statement.

2.6    The form of the AAAC Warrant agreement.

2.7    The prospectus filed with the SEC on Form 424B3 in respect of AAAC,
       describing (among other things) the Warrants, the Units and the Purchase
       Option Unit.

3      ASSUMPTIONS

In giving this opinion we have assumed (without further verification) the
completeness and accuracy of the Registered Agent's Certificate and the
Director's Certificate. We have also relied upon the following assumptions,
which we have not independently verified:

3.1    Copy documents, conformed copies or drafts of documents provided to us
       are true and complete copies of, or in the final forms of, the originals.

3.2    All signatures, initials and seals are genuine.

3.3    The accuracy and completeness of all factual representations expressed
       in or implied by the documents we have examined.

3.4    There is nothing under any law (other than the law of the British
       Virgin Islands) which would or might affect the opinions hereinafter
       appearing.

3.5    That all public records of the Company which we have examined are
       accurate and that the information disclosed by the searches which we
       conducted against the Company at the Registry of Corporate Affairs is
       true and complete and that such information has not since then been
       altered and that such searches did not fail to disclose any information
       which had been delivered for registration but did not appear on the
       public records at the date of our searches.

3.6    The Resolutions remain in full force and effect.

3.7    That the Company will assume the obligations of AAAC in respect of the
       Warrants, the Units and the (AAAC) Purchase Option Units, on the same
       terms (save that the securities issuable thereunder shall be securities
       in the Company), by virtue of the Merger Agreement.




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3.8    That no less than the par value shall be paid for the Ordinary Shares
       ultimately issuable pursuant to Warrants, Units and the Purchase Option
       Unit.

4      OPINIONS

Based upon, and subject to, the foregoing assumptions and the qualifications set
out below, and having regard to such legal considerations as we deem relevant,
we are of the opinion that:

4.1    The Company is a limited liability company duly incorporated under the
       BVI Business Companies Act, 2004 (the "Act"), in good standing at the
       Registry of Corporate Affairs and validly existing under the laws of the
       British Virgin Islands, and possesses the capacity to sue and be sued in
       its own name.

4.2    The Company is authorised to issue 39,000,000 shares of the following
       classes with a par value of US$0.0001 each:

       (a)    39,000,000 ordinary shares ("ORDINARY SHARES");

       of which [100] Ordinary Shares have been issued.

4.3    The [100] issued shares in the Company are registered in the name of
       AAAC, and are duly authorised and validly issued.

4.4    The Units, the Ordinary Shares, the Warrants and the Purchase Option
       Unit to be issued in accordance with the Merger Agreement, when issued in
       accordance with their governing instruments and the Company's memorandum
       and articles of association, and in the manner described in the
       Registration Statement, will be duly authorised, validly issued, fully
       paid and non assessable.

4.5    Upon the Merger becoming effective pursuant to the laws of the British
       Virgin Islands, the obligations of AAAC in respect of the Warrants, the
       Units and the AAAC Purchase Option Unit will be binding on the Company on
       the same terms thereof (save that the securities issuable thereunder
       shall be securities of the Company). Upon the Merger becoming effective,
       the Warrants will continue to be governed by the laws of the State of New
       York being the governing law of the AAAC Warrant Agreement and the AAAC
       Warrant Agreement will constitute the legal binding obligations of the
       Company.

5      QUALIFICATIONS

The opinions expressed above are subject to the following qualifications:

5.1    To maintain the Company in good standing under the laws of the British
       Virgin Islands, annual filing fees must be paid to the Registry of
       Corporate Affairs.

5.2    The obligations of the Company may be subject to restrictions pursuant
       to United Nations sanctions as implemented under the laws of the British
       Virgin Islands.

5.3    We reserve our opinion as to the extent to which the courts of the
       British Virgin Islands would, in the event of any relevant illegality,
       sever the offending provisions and enforce the remainder of the
       transaction of which such provisions form a part, notwithstanding any
       express provisions in this regard.

5.4    We make no comment with regard to the references to foreign statutes
       in the Registration Statement.

5.5    This opinion is confined to and given on the basis of the laws of the
       British Virgin Islands at the date hereof and as currently applied by the
       courts of the British Virgin Islands. We have not investigated and we do
       not express or imply nor are we qualified to express or imply any opinion
       on the laws of any other jurisdiction.


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6      CONSENTS

In connection with the above opinion, we hereby consent:

6.1    To the use of our name in the Registration Statement, the prospectus
       constituting a part thereof and all amendments thereto under the caption
       "Legal Matters"; and

6.2    To the filing of this opinion as an exhibit to the Registration
       Statement.

This opinion is limited to the matters detailed herein and is not to be read as
an opinion with respect to any other matter.



Yours faithfully

/s/ Maples and Calder


Maples and Calder











                                       4

                                   ANNEXURE A
                         REGISTERED AGENT'S CERTIFICATE







                                          REGISTERED AGENT'S CERTIFICATE

In this certificate:

<Table>
                     
- ------------------------------------------------------------------------------------
"Act"                   means the BVI Business Companies Act, 2004 (as attended).
- ------------------------------------------------------------------------------------
"BVI"                   means the British Virgin Islands.
- ------------------------------------------------------------------------------------
"Company"               means Tongxin international, Ltd.
- ------------------------------------------------------------------------------------
"FSC"                   means the BVI Financial Services Commission.
- ------------------------------------------------------------------------------------
"Register"              means the Register of Companies maintained by the Registrar.
- ------------------------------------------------------------------------------------
"Registered Agent"      means Maples Finance BVI Limited.
- ------------------------------------------------------------------------------------
"Registered Office"     means the Company's registered office, being Kingston
                        Chambers, PO Box 173, Road Town, Tortola, British Virgin
                        Islands.
- ------------------------------------------------------------------------------------
"Register Of Charges"   means a register 6f charges maintained at the Company's
                        Registered Office pursuant to section 162 6f the Act.
- ------------------------------------------------------------------------------------
"Registrar"             means the Registrar of Corporate Affairs in the BVI.
- ------------------------------------------------------------------------------------
</Table>

We, Maples Finance BVI Limited of Kingston Chambers, PO Box 173, Road Town,
Tortola, British Virgin Islands, being the Company's duly appointed Registered
Agent hereby certify that:

1    the Company was incorporated in the BVI on 8 February 2008 with company
     number 1463867;

2    the Company's name appears on the Register and it has paid all fees due and
     payable to the FSC.

As far as can be determined from the documents retained at the Registered
Office:

3    the Company has not commenced liquidation under the Ad or the Insolvency
     Act, 2003 (as amended);

4    no legal, arbitration or other administrative proceedings have been
     threatened Or commenced against the Company;

5    the Directors of the Company are as follows:

<Table>
                                         
- --------------------------------------------------------------------
Name                                        Appointment Date
- --------------------------------------------------------------------
William R. Herren                           4 March 2008
- --------------------------------------------------------------------
Rudy Wilson                                 4 March 2008
- --------------------------------------------------------------------
David J. Brophy                             4 March 2008
- --------------------------------------------------------------------
</Table>





<Table>
                                      
- -----------------------------------------------------------------
Ms. Pilar Albiac-Murillo                 4 March 2008
- -----------------------------------------------------------------
William Zielke                           4 March 2008
- -----------------------------------------------------------------
</Table>


6    the Shareholder of the Company is as follows:

<Table>
<Caption>
- -----------------------------------------------------------------------------------------------------
Name                                        Certificate      Shares            Allotment/
                                                No.         Allotted/          Acquisition
                                                            Acquired              date
- -----------------------------------------------------------------------------------------------------
                                                                      
Asia Automotive Acquisition Corporation        1               100              4 March 2008
- -----------------------------------------------------------------------------------------------------
</Table>

7    No entries have been made on the Company's Register of Charges.

8    All certifications are correct as at the 6th day of March, 2008


/s/
- ---------------------------------------------
For and on behalf of
Maples Finance BVI Limited - Registered Agent


                                                                               2








                                   ANNEXURE B
                             DIRECTOR'S CERTIFICATE










                            TONGXIN INTERNATIONAL LTD
                               ROAD TOWN, TORTOLA
                                     VG1110
                             BRITISH VIRGIN ISLANDS

                                                                    6 March 2008

To:      Maples and Calder
         Sea Meadow House
         PO Box 173
         Road Town
         Tortola
         British Virgin Islands

Dear Sirs

Tongin International Ltd (the "Company")

I, Rudy Wilson, being a director of the Company, am aware that you are being
asked to provide a legal opinion (the "Opinion") in relation to certain aspects
of British Virgin Islands law. Capitalised terms used in this certificate have
the meaning given to them in the Opinion. I hereby certify that:

1    The Company has not created any charges over any of its property or assets.

2    The written resolutions (the "Resolutions") of the board Of directors dated
     6 March 2008c were signed by all the directors in the manner prescribed in
     the Articles of Association of the Company, including as to the disclosure
     of any director's interests in the Registration Statement.

3    The Company is authorised to issue a maximum of 39,000,000 shares each with
     a par value of US$0.0001, of which 100 have been issued add are fully paid
     up.

4    The Shares to be offered and sold by the Company (including upon exercise
     or the warrants) as contemplated by the Form S-4 have been duly authorised
     for issue, and when issued by the company against payment in full, of the
     consideration, in accordance with the terms set out in the Form S-4 and the
     terms of the warrant agreement and underwriting agreement referred to in
     the Form S-4 and duly registered in the Company's register of member*
     (shareholders), such Shares will be validly issued, fully paid and
     non-assessable.

5    The shareholders of the Company have hot restricted or limited the powers
     of the directors in any way. There is no contractual or other prohibition
     (other than as arising under British Virgin Islands law) binding on the
     Company prohibiting it from performing its obligations under the
     Registration Statement.

6    The Resolutions were duly adopted, are In full force and effect at the date
     hereof and have not been amended, varied or revoked in any respect

7    The directors of the Company at the date of Resolutions and at the date
     hereof were and are as follows: William R. Herren, Rudy Wilson, William
     Zielke, David Brophy and Pilar Albiac-Murillo.



8    Each director considers the transactions contemplated by the Registration
     Statement to be of commerce benefit to the Company and has acted bona fide
     in the best Interests of the Company, and for a proper purpose of the
     Company, in relation to the transactions the subject of the Opinion.

9    To the best of my knowledge and belief, having made due inquiry, the
     Company is not the subject of legal, arbitral, administrative or other
     proceedings in any jurisdiction. Nor have the directors or shareholders
     taken any steps to have the Company struck off or placed in liquidation,
     nor have any steps been taken to wind up the Company. Nor has any receiver
     been appointed over any of the Company's property or assets.

I confirm that you may continue to rely on this Certificate as being true and
correct on the day that you issue the Opinion unless I shall have previously
notified you personally to the contrary.

Signature:        /s/ Rudy Wilson
                  ----------------------------------
                  Rudy Wilson
                  Director