| 0 | Maxwell / Empringham / Spenard / Bytzek | Bytzek Motorsport (CDN) | | Porsche | 911 GT1 | Evo | Porsche | GTS |
| 0T | Bytzek / Bytzek | Bytzek Motorsport (CDN) | | Porsche | 911 GT1 | Evo | Porsche | GTS |
| 01 | Schumacher / Bytzek / Brenner / Holtom | Bytzek Motorsport (CDN) | | Porsche | 911 GT1 | Evo | Porsche | GTS |
| 02 | Barbosa / Deware / Heinricy / *Minneker | Morrison/Mosler Racing (USA) | | Mosler | MT900 | R | Chevrolet | GT |
| 03 | Casadei / Bucci / Garbagnati / Nicolaidis | Haberthur Racing (CH) | | Porsche | 993 GT2 | | Porsche | GTS |
| 05 | Gutiérrez / Smith / Vuillaume / Cartier | Haberthur Racing (CH) | | Porsche | 996 GT3-R | | Porsche | GT |
| 06 | Snyder / Argetsinger / Longhi / *Jacobs | Jacobs Motorsports (USA) | Michael Jacobs | Riley & Scott | Mk III | | Ford | SRP |
| 07 | Marshall / Marshall / Van Overbeek / Holt | G&W Motorsports (USA) | | Porsche | 993 GT2 | | Porsche | GTS |
| 09 | Conway / Messley / Goad / Maugeri | Team X1-R (USA) | | Chevrolet | Camaro | | Chevrolet | AGT |
| 2 | O'Connell / Fellows / Kneifel / Fréon | Corvette Racing (USA) | | Chevrolet | Corvette C5-R | | Chevrolet | GTS |
| 3 | Earnhardt / Pilgrim / Collins / Earnhardt, Jr. | Corvette Racing (USA) | | Chevrolet | Corvette C5-R | | Chevrolet | GTS |
| 4 | Dayton / Burton / Sutherland / *Schubot | Philip Creighton Motorsports (USA) | | Lola | B2K/10 | | Ford | SRP |
| 5 | Gentilozzi / Pruett / *Miller / *Lazzaro | Rocketsports (USA) | Paul Gentilozzi | Saleen | S7-R | | Ford | GTS |
| 6 | Bucknum / Sherman / Duder / *Tiller | TRP Racing | Michael Atkins | Lola | B2K/40 | | Nissan | SRPII |
| 7 | Diez de Villarroel / Orti / Warner / Zitza | Broadfoot Racing (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 8 | Konrad / Heath / Slater / Salles | Konrad Motorsport (D) | | Lola | B2K/10 | | Ford | SRP |
| 9 | Bunting / Assentato / Schearer / Ahlgrim | Genesis Racing | | BMW | M3 E36 | | BMW | GT |
| 10 | Auberlen / Gleason / Fairbanks / Miller | Genesis Racing (USA) | | BMW | M3 E46 | | BMW | GT |
| 11 | Bupp / Greer / Mills / Gregg | Hamilton Safe Motorsports (USA) | | Chevrolet | Camaro | | Chevrolet | AGT |
| 12 | Kelleners / Brabham / McNish / van de Poele | Risi Competizione (USA) | | Ferrari | 333 SP | | Ferrari | SRP |
| 12T | | Risi Competizione (USA) | | Ferrari | 333 SP | | Ferrari | SRP |
| 13 | Kicak / Kosovych / Burkland / Pilla | Free Spirit Motorsports | | Porsche | 993 GT2 | | Porsche | GTS |
| 14 | Friedman / Merzon / Demeroutis / Wilson | Autometrics Motorsports | | Porsche | 993 Carrera | RSR 3.8 | Porsche | GT |
| 15 | Vann / Bingham / *Ara / *Nearn | Chamberlain Motorsports (GB) | Hugh Chamberlain | Dodge | Viper | GTS-R | Dodge | GTS |
| 16 | Weaver / Leitzinger / Wallace | Dyson Racing Team (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 17 | Riccitelli / Quester / Duez / Hofer | RWS Motorsports (D) | | Porsche | 996 GT3-R | | Porsche | GT |
| 18 | Willes / McNeil / Leavy / *Vallarano | Comer Racing | James Comer | Chevrolet | Corvette | | Chevrolet | AGT |
| 20 | Forbes-Robinson / Dyson / Papis / Jönsson | Dyson Racing Team (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 21 | Lally / Macey / Henderson / Seldon | Archangel Motorsport Services (USA) | Michael Johnson | Lola | B2K/40 | | Nissan | SRPII |
| 22 | Davis / Dudek / Durand / Clinton | Archangel Motorsport Services (USA) | Michael Johnson | Lola | B2K/40 | | Nissan | SRPII |
| 23 | Montgomery / Penton / *Dro / *Cachet | Gwen Racing | | Chevrolet | Camaro | | Chevrolet | AGT |
| 24 | Euser / Lockie / Buurman | Marcos Racing International | | Marcos | Mantara LM600 | | Chevrolet | GTS |
| 25 | de Castro / Van der Kolk / Lassally | Marcos Racing International (NL) | | Marcos | Mantara LM600 | | Chevrolet | GTS |
| 26 | Whitehead / Zacharias / Giangrande / Hall | Northstar Racing | | Lola | B2K/40 | | Nissan | SRPII |
| 27 | Theys / Lienhard / Bentley / Baldi | Lista Doran Racing (USA) | | Crawford | SSC2K | | Judd | SRP |
| 28 | Trenery / Emmett / Trenery / van Schoote | Intersport Racing (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 30 | Peroni / Ring / Sergey / Montermini | Mastercar (I) | | Ferrari | F355 | | Ferrari | GTS |
| 31 | Menzel / Pobst / Fitzgerald / Luhr | White Lightning Racing | | Porsche | 996 GT3-RS | | Porsche | GT |
| 32 | Goldin / Finlay / Rankin / Goldin | Goldin Bros Racing | | Mazda | RX-7 | | Mazda | GT |
| 34 | Pumpelly / Ivankovich / Pumpelly / Dilorio | Spencer Pumpelly Racing | | Porsche | 996 GT3-R | | Porsche | GT |
| 35 | Richter / Calderari / Bryner / Alzen | Jurgen Alzen Motorsports (D) | | Porsche | 996 GT3-R | | Porsche | GT |
| 36 | Zadra / Couceiro / Gallade / Huisman | Jurgen Alzen Racing (D) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 37 | Field / Rosenblad / Field / Field | Intersport Racing (USA) | | Lola | B2K/10 | | Judd | SRP |
| 38 | Schroeder / Wollek / Haywood / Maassen | Champion Racing (USA) | | Lola | B2K/10 | | Porsche | SRP |
| 39 | Plumb / Hiskey / Culver / *Petersen | White Lightning Racing (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 40 | De Castro / Cattaneo / Bicciato / Bugané | Mac Racing (I) | | Porsche | 996 GT3-R | | Porsche | GT |
| 41 | Mancini / Collini / Rapetti / Neugarten | Mac Racing (I) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 42 | Byrne / *Millman / *Kester / *Collucci | Orbit | | Porsche | 996 GT3-RS | | Porsche | GT |
| 43 | Baron / Petty / Buitoni / Hindery / Kester | Orbit (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 44 | Varde / Amick / Amick / Lester | Team Amick Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 45 | Jacobs / Del Vecchio / Hilliar / Morcek / Webb / Langhorne | Jacobs Motorsports (USA) | Michael Jacobs | Lola | B98/10 | | Ford | SRP |
| 46 | Hitt / *Thompson / *Nagle / *Bogusz | ACP Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 47 | Foster / Schultheis / Neuman / Bleustein | Evil Eye Racing | | Porsche | 996 GT3-RS | | Porsche | GT |
| 48 | Lewis / Lambert / Seiler | Pilbeam Racing America (USA) | | Pilbeam | MP84 | | Nissan | SRPII |
| 49 | Phil Harris | Pilbeam Racing America (USA) | | Pilbeam | MP84 | | Nissan | SRPII |
| 50 | Stanton / Hajducky / Suzuki | Aasco - Boduck | | Porsche | 996 GT3-R | | Porsche | GT |
| 52 | Gabel / Safina / Lowman / de Quesada | Safina Racing (USA) | Joseph Safina | BMW | M3 E36 | | BMW | GT |
| 53 | Curran / Smith / Snyder / Scheuren | Diablo Racing (USA) | Ellen Barbara | Chevrolet | Camaro | IV | Chevrolet | AGT |
| 54 | Jennings / Stuck / Borcheller / Said | JET Motorsports | | BMW | M3 E46 | GTR | BMW | GT |
| 55 | Suzuki / Takahashi / Mitsuyama / Yamaji | Club: Yellow Magic | | Ferrari | F355 | | Ferrari | GT |
| 56 | Rosa / Babini / Caffi / Rosa | Seikel Motorsport (D) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 57 | Buttiero / Collin / Bagnall / Burgess | Seikel Motorsport (D) | | Porsche | 996 GT3-R | | Porsche | GT |
| 58 | Tambourine / Drummond / Hall / Espenlaub | Team Tambourine | | Mazda | MX-5 | Miata | Mazda | GT |
| 60 | Lister / Youles / Moss / Turner | PK Sport (GB) | | Porsche | 996 GT3-R | | Porsche | GT |
| 62 | Grupp / Hampton / Spencer | Team Spencer Motorsports | | Kudzu | DLM | | Mazda | SRPII |
| 63 | Katz / Ronson / Smith / Downing | Downing Atlanta (USA) | Jim Downing | Kudzu | DLY | | Mazda | SRP |
| 64 | Kraus / Kintzi / Jodexnis / Werner | Dreamcarsonline.com | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 65 | Hürtgen / Orcutt / Lorenz / Langfermann | Cirtek Motorsport (GB) | | Porsche | 996 GT3-R | | Porsche | GT |
| 66 | Gaughran / Marks / Miller / Takahashi | The Racer's Group (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 67 | Kitch / Parker / Gaylord / Oberholtzer | The Racer's Group (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 68 | Buckler / Michaelian / Earle / Malagamuwa | The Racer's Group (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 69 | Felbermayr, Jr. / Felbermayr / Ried / Ried | Proton Competition (D) | | Porsche | 993 GT2 | | Porsche | GTS |
| 71 | Hane / Thiel / Horn / Jurasz | Freisinger Motorsports (D) | | Porsche | 996 GT3-R | | Porsche | GT |
| 72 | Worth / Sansone / Pfeifer | Pettit Racing (USA) | Cameron Worth | Mazda | RX-7 | | Mazda | GT |
| 74 | Baldwin / Robinson / Hoerr / Lazier | Robinson Racing (USA) | | Riley & Scott | Mk III | | Judd | SRP |
| 75 | Policastro, Jr. / Policastro / Desimone / Zitza | Gunnar Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 76 | Jeannette / Jackson / *Newman / *Brockman | Gunnar Racing (USA) | | Porsche | 911 GT1 | Evo | Porsche | GTS |
| 78 | Roussel / Macaluso / Sezionale / Forgeois | Sezio Florida Racing Team | | Norma | M2000 | -01 | Mader | SRP |
| 79 | Björk / Loven / Oberto / Dickens | Sportscar Racing Team Sweden (S) | | Lola | B2K/40 | | Nissan | SRPII |
| 80 | Morton / Schrom / Mazzuoccola / Hayner | G&W Motorsports (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 81 | Law / Drendel / Murry / Wagner | G&W Motorsports (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 83 | Simon / Simo / DeVries / *Lauer | Bob Akin Motorsports (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 86 | Kaufmann / Stewart / Chateau / *Orti | Freisinger Motorsports (D) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 89 | Pootmans / St. Jacques / Julien / Woodman | Porsche Haus Racing (CDN) | | Lola | B2K/40 | | Nissan | SRPII |
| 91 | Warnock / Comombo / *Sá Nogueira / *D'Agostin | Cirtek Motorsport | | Porsche | 993 GT2 | | Porsche | GTS |
| 92 | Haupt / Kumpen / Rice / *Young | Cirtek Motorsport (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 95 | Schroeder / *Volk / *Mirro / *Waddell | TRV Motorsports | | Riley & Scott | Mk III | | Chevrolet | SRP |
| 96 | Bacher / Puleo / Hauser / Dubler | Tropic Zone Racing | | Oldsmobile | Cutlass | | Chevrolet | AGT |
| 114 | Zonca / Sangiuolo / Duno / Gooding | Chamberlain Motorsports (GB) | Hugh Chamberlain | Dodge | Viper | GTS-R | Dodge | GTS |