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Exhibit 21
TENNECO AUTOMOTIVE INC.
SUBSIDIARIES AND AFFILIATES
<Table>
TENNECO AUTOMOTIVE INC. (DELAWARE)
Tenneco Automotive Inc. (Nevada) ........................................................................... 100%
Tenneco Automotive Operating Company Inc. .................................................................. 100%
Beijing Monroe Automobile Shock Absorber Company Ltd. (PRC) ....................................... 51
(Tenneco Automotive Operating Company Inc. owns 51%; and Beijing
Automotive Industry Corporation, an unaffiliated company, owns 49%)
Dalian Walker-Gillet Muffler Co. Ltd. (Peoples Republic of China) ................................. 55
(Tenneco Automotive Operating Company Inc. owns 55%; and
non-affiliates own 45%)
McPherson Strut Company Inc. (Delaware) ........................................................... 100
Precision Modular Assembly Corp. (Delaware) ....................................................... 100
Shanghai Walker Exhaust Company, Ltd. (Peoples Republic of China) ................................. 55
(Tenneco Automotive Operating Company Inc. owns 55%; and Shanghai
Tractor and Internal Combustion Engine Company, Ltd., an
unaffiliated company, owns 45%)
Tenneco Asheville Inc. (Delaware) ................................................................. 100
Tenneco Asia Inc. (Delaware) ...................................................................... 100
Tenneco Automotive Foreign Sales Corporation Limited (Jamaica) .................................... 100
Tenneco Automotive Japan Ltd. (Japan) ............................................................. 100
Tenneco Automotive Nederlands B.V. (Netherlands) .................................................. 100
Tenneco Automotive RSA Company (Delaware) ......................................................... 100
Tenneco Automotive Trading Company (Delaware) ..................................................... 100
Tenneco Automotive (Thailand) Co. Ltd. (Thailand) ................................................. 100
Walker Exhaust (Thailand) Co. Ltd. (Thailand) ............................................ 75%
(Tenneco Automotive (Thailand) Co. Ltd. and affiliated persons own 75%
and Yarnapund Ltd., an unaffiliated company, owns 25%)
Tenneco Brake, Inc. (Delaware) .................................................................... 100
Tenneco Europe Limited (Delaware) ................................................................. 100
Wimetal S.A. (France) .................................................................... < 1
(Tenneco Europe Limited owns 1 share; Walker Limited owns 1 share;
Walker France S.A. owns 99%; and 7 affiliated persons own 1 share each)
Tenneco International Finance Limited (United Kingdom) ............................................ 100
Tenneco International Holding Corp. (Delaware) .................................................... 100
Monroe Australia Pty. Limited (Australia) ................................................ 100
Monroe Springs (Australia) Pty. Ltd. (Australia) ................................ 100
Monroe Superannuation Pty. Ltd. (Australia) ..................................... 100
Walker Australia Pty. Limited (Australia) ....................................... 100
Tenneco Automotive Europe N.V. (Belgium) ................................................. 100
Monroe Amortisor Imalat Ve Ticaret A.S. (Turkey) ................................ 99.85
(Tenneco Automotive Europe N.V. owns 99.85%; and various
unaffiliated individual stockholders own 0.15%)
Monroe Packaging N.V. (Belgium) ................................................. 99.9
(Tenneco Automotive Europe N.V. owns 99.9%; and Tenneco
Automotive France S.A. owns 0.1%)
Tenneco Automotive Europe Coordination Center B.V.B.A. (Belgium) ................ 99.9
(Tenneco Automotive Europe N.V. owns 99.9%; and Tenneco
Automotive France S.A. owns 0.1%)
</Table>
TENNECO AUTOMOTIVE INC.
SUBSIDIARIES AND AFFILIATES
<Table>
SUBSIDIARIES OF TENNECO AUTOMOTIVE INC. (DELAWARE)
SUBSIDIARIES OF TENNECO AUTOMOTIVE OPERATING COMPANY INC. (DELAWARE)
SUBSIDIARIES OF TENNECO INTERNATIONAL HOLDING CORP. (DELAWARE)
Tenneco Automotive Italia S.r.l. (Italy) ................................................. 85 %
(Tenneco International Holding Corp. owns 85%; and Tenneco
Automotive France, S.A. owns 15%)
Tenneco Automotive Polska Sp. z.O.O. (Poland) ............................................ 1
(Tenneco International Holding Corp. owns 1%; and Tenneco Global Holdings
Inc. owns 99%)
Tenneco Romania Srl (Romania) ............................................................ 0.14
(Tenneco International Holding Corp. owns 0.14%; and Tenneco Global
Holdings Inc. owns 99.86%)
Tenneco Automotive Services SAS (France) ................................................. 100
Tenneco Automotive Services A.B. (Sweden) ................................................ 100
Tenneco Canada Inc. (Ontario) ............................................................ 100
Tenneco Global Holdings Inc. (Delaware) .................................................. 100
Fric-Rot S.A.I.C. (Argentina) ................................................... 55
(Tenneco Global Holdings INC. owns 55%; Maco Inversiones S.A.
owns 44.85%; and unaffiliated parties own .15%)
Maco Inversiones S.A. (Argentina) ............................................... 100
Fric-Rot S.A.I.C. (Argentina) ......................................... 44.85
(Maco Inversiones S.A. owns 44.85%; Tenneco Global Holdings
Inc. owns 55%; and unaffiliated parties own .15%)
Monroe Springs (New Zealand) Pty. Ltd. (New Zealand) ............................ 100
Monroe Czechia s.r.o. (Czech Republic) .......................................... 100
Tenneco Automotive Iberica, S.A. (Spain) ........................................ 100
Tenneco Automotive Polska Sp.z.O.O. (Poland) .................................... 99
(Tenneco Global Holdings Inc. owns 99%; and Tenneco International
Holding Corp. owns 1%)
Tenneco Romania Srl (Romania) ................................................... 99.86
(Tenneco Global Holdings Inc. owns 99.86%; and Tenneco International
Holding Corp. owns 0.14%)
Tenneco Mauritius Limited (Mauritius) ........................................... 100
Hydraulics Private Limited (India) .............................................. 51
(Tenneco Mauritius Limited owns 51% and Bangalore Union
Services Limited, an unaffiliated company, owns 49%)
Renowned Automotive Products Manufacturers Ltd. (India) ................ 99
(Hydraulics Limited owns 99+%; and non-affiliates own 1%)
Tenneco Mauritius Holdings Limited .............................................. 100 %
Tenneco Automotive India Private Limited (India) ................................ 100
Walker Exhaust India Private Limited (India) ........................... 90
(Tenneco Automotive India Private Limited owns less than
90%; and an unaffiliated party owns 10%)
Tenneco Holdings Danmark A/S (Denmark) ................................................... 100
Gillet Exhaust Technologie (Proprietary) Limited (South Africa) ................. 100
Gillet Lazne Belohrad, s.r.o. (Czech Republic) .................................. 100
</Table>
TENNECO AUTOMOTIVE INC.
SUBSIDIARIES AND AFFILIATES
<Table>
SUBSIDIARIES OF TENNECO AUTOMOTIVE INC. (DELAWARE)
SUBSIDIARIES OF TENNECO AUTOMOTIVE OPERATING COMPANY INC. (DELAWARE)
SUBSIDIARIES OF TENNECO INTERNATIONAL HOLDING CORP. (DELAWARE)
SUBSIDIARIES OF TENNECO HOLDINGS DENMARK A/S (DENMARK)
Kinetic Pty. Ltd. (Australia) ................................................... 99 %
(Tenneco Holdings Danmark A/S owns 99%+; and unaffiliated
entities own less than 1%)
Tenneco Automotive Holdings South Africa Pty. Ltd. (South Africa) ............... 74.9
(Tenneco Holdings Danmark A/S owns 74.9%; and an unaffiliated
party owns 25.1%)
Armstrong Hydraulics South Africa (Pty.) Ltd. (South Africa) ........... 100
Armstrong Properties (Pty.) Ltd. (South Africa) ........................ 100
Monroe Manufacturing (Pty.) Ltd. (South Africa) ........................ 100
Smiths Industrial (SWA) (Pty.) Ltd. (South Africa) ..................... 100
Tenneco Automotive Port Elizabeth (Proprietary) Limited
(South Africa) ......................................................... 100
Tenneco Automotive Portugal - Componentes para Automovel, S.A.
(Portugal) ............................................................. 100
Walker Danmark A/S (Danmark) .................................................... 100
Tenneco Automotive Eastern Europe S.p. z.O.O. (Poland) .......................... 100
Tenneco Automotive France S.A. (France) .................................................. 100
(Tenneco International Holding Corp. owns 470,371 shares; Walker
Europe, Inc owns 1 share and 8 affiliated persons own an aggregate
of 28 shares)
Gillet Tubes Technologies G.T.T. (France) ....................................... 100
Monroe Packaging N.V. (Belgium) ................................................. 0.1
(Tenneco Automotive Europe N.V. owns 99.9%; and Tenneco
Automotive France S.A. owns 0.1%)
Tenneco Automotive Europe Coordination Center N.V. (Belgium) .................... 0.1
(Tenneco Automotive Europe N.V. owns 99.9%; and Tenneco
Automotive France S.A. owns 0.1%)
Tenneco Automotive Italia S.r.l. (Italy) ........................................ 15
(Tenneco International Holding Corp. owns 85%; and Tenneco
Automotive France S.A. owns 15%)
Walker France Constructeurs S.A.R.L. (France) ................................... 100
Wimetal S.A. (France) ........................................................... 99
(Tenneco Automotive France S.A. owns 99%; Tenneco Europe Limited
owns 1 share, Walker Limited owns 1 share; and 6 affiliated persons own
1 share each
The Pullman Company (Delaware) .................................................. 100
Autopartes Walker S.A. de C.V. (Mexico) ................................ 100
Consorcio Terranova S.A. de C.V. (Mexico) ..................... 99.99
(Autopartes Walker S.A. de C.V. owns 99.99%; and Josan
Latinamericana S.A. de C.V., an unaffiliated company owns 0.01%)
</Table>
TENNECO AUTOMOTIVE INC.
SUBSIDIARIES AND AFFILIATES
<Table>
SUBSIDIARIES OF TENNECO AUTOMOTIVE INC. (DELAWARE)
SUBSIDIARIES OF TENNECO AUTOMOTIVE OPERATING COMPANY INC. (DELAWARE)
SUBSIDIARIES OF THE PULLMAN COMPANY (DELAWARE)
SUBSIDIARIES OF AUTOPARTES WALKER S.A. DE C.V. (MEXICO)
Monroe-Mexico S.A. de C.V. (Mexico) ........................................... 100%
Tenneco Automotive Servicios de Mexico, S.A. de C.V. (Mexico) ............ 0.01
(Monroe-Mexico, S.A. de C.V. owns 1 share; and Proveedora
Walker S. de R.L. de C.V. owns 49,999 shares)
Proveedora Walker S. de R.L. de C.V. (Mexico) ................................. 99.99
(Autopartes Walker S.A. de C.V. owns 99.99%; and Pullmex S. de
R.L. de C.V. owns .01%)
Pullmex S. de R.L. de C.V. (Mexico) ...................................... 0.01
(Proveedora Walker S. de R.L. de C.V. owns 0.01% and
Autopartes Walker S.A. de C.V. owns 99.99%)
Tenneco Automotive Servicios de Mexico, S.A. de C.V. (Mexico) ............ 99.99
(Proveedora Walker S. de R.L. de C.V. owns 49,999 shares, and
Monroe-Mexico, S.A. de C.V. owns 1 share)
Pullmex S. de R.L. de C.V. (Mexico) ........................................... 99.99
(Autopartes Walker S.A. de CAT, owns 99.9%; and Proveedora
Walker S. de R.L. de C.V. owns 0.1%)
Proveedora Walker S. de R.L. de C.V. (Mexico) ............................ 0.01
(Pullmex S. de R.L. de C.V. owns 0.01%; and Autopartes
Walker S.A. de C.V. owns 99.99%)
Clevite Industries Inc. (Delaware) ................................................. 100
Peabody International Corporation (Delaware) ....................................... 100
Barasset Corporation (Ohio) ................................................... 100
Peabody Galion Corporation (Delaware) ......................................... 100
Peabody Gordon-Piatt, Inc. (Delaware) ......................................... 100
Peabody N.E., Inc. (Delaware) ................................................. 100
Tenneco Automotive China Inc. (Delaware) ...................................... 100
Peabody-Myers Corporation (Illinois) .......................................... 100
Pullman Canada Ltd. (Canada) .................................................. 61
(Peabody International Corporation owns 61%; and The Pullman
Company owns 39%)
Pullman Canada Ltd. (Canada) ....................................................... 39
(The Pullman Company owns 39%; and Peabody International
Corporation owns 61%)
Pullman Standard Inc. (Delaware) ................................................... 100
Tenneco Brazil Ltda. (Brazil) ...................................................... 100
Tenneco Automotive Brasil Ltda. (Brazil) ...................................... 100
Thompson and Stammers Dunmow (Number 6) Limited (United Kingdom) ........................ 100
Thompson and Stammers Dunmow (Number 7) Limited (United Kingdom) ........................ 100
TMC Texas Inc. (Delaware) ............................................................... 100
Walker Electronic Silencing Inc. (Delaware) ............................................. 100
Walker Europe, Inc. (Delaware) .......................................................... 100
</Table>
TENNECO AUTOMOTIVE INC.
SUBSIDIARIES AND AFFILIATES
<Table>
SUBSIDIARIES OF TENNECO AUTOMOTIVE INC. (DELAWARE)
SUBSIDIARIES OF TENNECO AUTOMOTIVE OPERATING COMPANY INC. (DELAWARE)
SUBSIDIARIES OF WALKER EUROPE, INC. (DELAWARE)
Tenneco Automotive Prance S.A. (France) ............................................ < 1%
(Tenneco International Holding Corp. owns 470,371 shares and 7 affiliated
persons own an aggregate of 28 shares)
Walker Limited (United Kingdom) ......................................................... 100
Gillet Torsmaskiner UK Limited (United Kingdom) ............................... 50
(Walker Limited owns 100 A Ordinary Shares, 50% of total equity; and
AB Torsmaskiner, an unaffiliated company, owns 100 B Ordinary Shares,
50% of total equity)
Exhaust Systems Technology Limited (United Kingdom) ........................... 99.99
(Gillet Torsmaskiner UK Limited owns 99.99%; and Heinrich
Gillet GmbH & Co. owns .01%)
Futaba-Tenneco UK Limited ..................................................... 49
(Walker Limited owns 49% and Futaba Industrial Co. Ltd owns 51%)
Tenneco Automotive UK Limited (United Kingdom) ..................................... 100
Gillet Exhaust Manufacturing Limited (United Kingdom) ......................... 100
Gillet Pressings Cardiff Limited (United Kingdom) ............................. 100
Walker (UK) Limited (United Kingdom) .......................................... 100
J.W. Hartley (Motor Trade) Limited (United Kingdom) ...................... 100
Tenneco - Walker (U.K.) Ltd. (United Kingdom) ............................ 100
Tenneco Management (Europe) Limited (United Kingdom) ............................... 100
Wimetal S.A. (France) .............................................................. < 1
(Walker Limited owns 1 share; Tenneco Europe Limited owns 1 share; Tenneco
Automotive France S.A. owns 99%; and 6 affiliated persons own 1 share each)
Walker Manufacturing Company (Delaware) ................................................. 100
Cad's Inc. (Illinois) .............................................................. 100
Walker Norge A/S (Norway) ............................................................... 100
Tenneco Deutschland Holdinggesellschaft mbH (Germany) ........................................ 99.97
(Tenneco Automotive Inc. owns 99.97%; and Atlas Vermoegensverwaltung, an
unaffiliated company, owns 0.03%)
GILLET Unternehmesverwaltungs GmbH (Germany) ............................................ 100
Heinrich Gillet GmbH & Co. KG (Germany) ............................................ 0.1
(GILLET Unternehmesverwaltungs GmbH owns 0.1%; and Tenneco
Deutschland Holdinggesellschaft mbH owns 99.9%. The subsidiaries of
Heinrich Gillet GmbH & Co. KG are listed below.)
Heinrich Gillet GmbH & Co. KG (Germany) ................................................. 99.9
(Tenneco Deutschland Holdinggesellschaft mbH own~ 99.9%; and
GILLET Unternehmesverwaltungs GmbH owns 0.1%)
ELGIRA Montagebetrieb fur Abgasanlagen Rastatt GmbH (Germany) ...................... 50
(Heinrich Gillet GmbH & Co. KG owns 50%; and an unaffiliated
party owns 50%)
</Table>
TENNECO AUTOMOTIVE INC.
SUBSIDIARIES AND AFFILIATES
<Table>
SUBSIDIARIES OF TENNECO AUTOMOTIVE INC. (DELAWARE)
SUBSIDIARIES OF TENNECO DEUTSCHLAND HOLDINGGESELLSCHAFT MBH (GERMANY)
SUBSIDIARIES OF HEINRICH GILLET GMBH & CO. KG (GERMANY)
Exhaust Systems Technology Limited (United Kingdom) ............................... 0.01%
(Heinrich Gillet GmbH & Co. KG owns 0.01%; and Gillet Torsmaskiner
UK Limited owns 99.99%)
Giller-Abgassysteme Zickau Gmbh (Germany) ......................................... 100
Elagest AR (Sweden) .......................................................... 50
(Gillet-Abgassysteme Zickau GmbH owns 50%; and an
unaffiliated party owns 50%)
Mastra-Gillet Industria e Comercio Ltda. (Brazil) ................................. 50
(Heinrich Gillet GmbH & Co. KG owns 50%; and Mastra Industria e
Comercio Ltda., an unaffiliated company, owns 50%)
Montagewerk Abgastechnik Emden GmbH (Germany ...................................... 50
(Heinrich Gillet GmbH & Co. KG owns 50%; and an unaffiliated
party owns 50%)
Tenneco Automotive Deutschland GmbH (Germany) .......................................... 100
WALKER GILLET (Europe) GmbH (Germany) .................................................. 100
</Table>