| 0 | Holtom / Spenard / Empringham / Bytzek / *Bytzek | Bytzek Motorsports (CDN) | | Porsche | 911 GT1 | Evo | Porsche | GTS |
| 00 | Empringham / Bytzek / Spenard / Holtom | Bytzek Motorsports (CDN) | | Porsche | 911 GT1 | Evo | Porsche | GTS |
| 03 | Shuster / Baisden / Annis / Lassally | Marcos Racing International USA | | Marcos | Mantis | Plus | Ford | GT |
| 04 | de Groodt / Van der Kolk / van Riet / Jacobsen | Marcos Racing International USA | | Marcos | Mantis | Plus | Ford | GT |
| 05 | Bucknum / Ehret / *McMurry / *Dyer | Team Bucknum Racing (USA) | | Pilbeam | MP84 | | Nissan | SRPII |
| 06 | James / *Jacobs / *Paul, Jr. / *Duder / *DeFontes | Jacobs Motorsports (USA) | Michael Jacobs | Riley & Scott | Mk III | | Ford | SRP |
| 07 | Law / Marshall / Trentini / *Wagner | G&W Motorsports | | Picchio | D-USA | | BMW | SRPII |
| 08 | Euser / Lockie / Huisman | Marcos Racing International (NL) | Cor Euser | Marcos | Mantara | LM600 Evo | Chevrolet | GTS |
| 09 | Conway / Goad / Pilgrim / Ciasulli | Flis Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 2 | Lammers / Mowlem / Stewart | Crawford Racing | | Crawford | SSC2K | | Judd | SRP |
| 3 | Gentilozzi / Pruett / Lauer / Simo | Rocketsports Racing (USA) | Paul Gentilozzi | Jaguar | XKR | | Ford | GTS |
| 4 | Bryant / Goldrich / Gooding / Maenpaa | Brookspeed Racing (GB) | | Dodge | Viper | GTS-R | Dodge | GTS |
| 7 | Riccitelli / Vosse / Quester / Said | RWS Motorsport (D) | | Porsche | 996 GT3-R | | Porsche | GTS |
| 8 | Lazzaro / Rand / Borcheller / Kelleners | Rand Racing/Risi Competizione (USA) | | Lola | B2K/40 | | Nissan | SRPII |
| 9 | Felbermayr, Jr. / Felbermayr / Knapfield / Ahrlé | RWS Motorsport (D) | | Porsche | 996 GT3-R | | Porsche | GT |
| 10 | Snyder / Fairbanks / Longhi / Assentato | Genesis (USA) | Emil Assentato | BMW | M3 | E46 GT | BMW | GT |
| 12 | Smith / Mall / Scarallo / Dwyer | K&N Filters Racing | | Ultima | GTR | | | GTS |
| 13 | van de Poele / Brabham / Johansson | Risi Competizione (USA) | | Ferrari | 333 SP | | Ferrari | SRP |
| 16 | Weaver / Leitzinger / Gavin | Dyson Racing Team (USA) | | Riley & Scott | Mk III | Series 2 | Ford | SRP |
| 18 | Malagamuwa / Deware / *Lamb / *Short | Boston Motorsports Group | | Mosler | MT900 | R | Chevrolet | GT |
| 19 | Hitt / Briody / Trinkler / Lewis / *Ludwik | ACP Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 20 | Forbes-Robinson / Dyson / Dyson / Schroeder | Dyson Racing Team (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 21 | Clinton / Connor / Tillman / Francois | Archangel Motorsport Services (USA) | Michael Johnson | Lola | B2K/40 | | Nissan | SRPII |
| 22 | Block / Knight / DeVries / Hawkins | Archangel Motorsport Services (USA) | Michael Johnson | Lola | B2K/40 | | Nissan | SRPII |
| 23 | Collins / Zwart / Vann | Team Ascari (GB) | | Ascari | KZR-1 | | BMW | SRP |
| 24 | Barbosa / Neugarten / Perrier | Perspective Racing (F) | | Mosler | MT900 | R | Chevrolet | GT |
| 27 | Theys / Lienhard / Papis / Baldi | Doran Lista Racing (USA) | | Dallara | SP1 | | Judd | SRP |
| 29 | Hoerr / Duncan / Busch / Brassfield | Sky Blue Racing | | Ford | Mustang | | Ford | AGT |
| 30 | Field / Oberto / Neuhaus / Field | Intersport Racing (USA) | | Lola | B2K/10 | | Judd | SRP |
| 31 | Slater / Seiler / Short / Jeannette / *Rice | Konrad Motorsport (D) | | Saleen | S7-R | | Ford | GTS |
| 33 | Wagner / Auberlen / Bertuzzi / Cope | Scuderia Ferrari of Washington (USA) | | Ferrari | 360 Modena | N-GT | Ferrari | GT |
| 34 | Pumpelly / *Ivankovich / *Pobst / *Hiskey | ZIP Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 35 | Green / Valentine / Walsh / Dilorio | ZIP Racing | | Porsche | 996 GT3-R | | Porsche | GT |
| 36 | Smith / Sharp / Gordon / Matthews | Jim Matthews Racing (USA) | | Riley & Scott | Mk III C | | Elan | SRP |
| 37 | Field / Dayton / Durand / Sutherland | Intersport Racing (USA) | | Lola | B2K/10 | B | Judd | SRP |
| 38 | Wallace / Maassen / Haywood / Luhr | Champion Racing (USA) | | Lola | B2K/10 | | Porsche | SRP |
| 39 | Papadopoulos / Friedman / Plumb | Autosport Race Team | | Porsche | 996 GT3-R | | Porsche | GT |
| 40 | Refenning / Jones / Vargo / de Quesada | Alegra Motorsports/901 Shop (USA) | | BMW | M3 | E46 GT | BMW | GT |
| 42 | Byrne / Peterson / Earle / Millman | Team Greeneman (USA) | | Porsche | 996 GT3-RS | | Porsche | GTS |
| 43 | Baron / Petty / Borkowski / Hindery | Orbit Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 44 | Schultheis / Kester / Tremblay / Wellman | Orbit Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 45 | Hezemans / Gregg / Zonca / Bunting | American Viper Racing (USA) | | Dodge | Viper | GTS-R | Dodge | GTS |
| 46 | Morgan / Richards / Richards / Morgan | Morgan Dollar Motorsports | | Chevrolet | Corvette | | Chevrolet | AGT |
| 49 | Lupberger / Bell / Toivonen | Team Ascari (GB) | | Ascari | KZR-1 | | Judd | SRP |
| 50 | Stanton / *Hajducky / *Suzuki / *Quiros | Aasco/Boduck Racing | Dennis Aase | BMW | M3 | E46 GT | BMW | GT |
| 51 | Bingham / MacLeod / Gaughran / Rice | Park Place Racing/Team Seattle | | Saleen | S7-R | | Ford | GTS |
| 53 | Bentley / Lambert / Kitch / Gaylord | Park Place Racing/Team Seattle (USA) | | Saleen | S7-R | | Ford | GTS |
| 54 | Cunningham / van der Merwe / Petery / Atapattu | Bell Motorsports | | BMW | M3 | E46 GT | BMW | GT |
| 55 | Dewey / Grimm / Rankin / *Smith | Dewey Motorsports (USA) | Bruce Dewey | Chevrolet | Camaro | IV | Chevrolet | AGT |
| 56 | Drudi / Rosa / Rosa / Caffi | Seikel Motorsport (D) | Peter Seikel | Porsche | 996 GT3-RS | | Porsche | GT |
| 57 | Plumb / Burgess / Collin / Shep | Seikel Motorsport (D) | Peter Seikel | Porsche | 996 GT3-RS | | Porsche | GT |
| 60 | Puleo / Dubler / *Gschwender / *Hauser | Xtreme Racing Group | | Chevrolet | Corvette | | Chevrolet | AGT |
| 62 | Spencer / Waddell / Hampton / Grupp | Team Spencer Motorsports | | Kudzu | DLM | /FW | Mazda | SRPII |
| 63 | Nearburg / Ronson / Lloyd / Downing | Downing Atlanta (USA) | Jim Downing | Kudzu | DLY | | Mazda | SRP |
| 66 | Buckler / Schrom / Bergmeister / Bernhard | The Racers Group (USA) | Kevin Buckler | Porsche | 996 GT3-RS | | Porsche | GT |
| 67 | Michaelian / Manfredi / Daniels / Talbert | The Racers Group (USA) | Kevin Buckler | Porsche | 996 GT3-RS | | Porsche | GT |
| 68 | Nearn / Nagel / Zacharias / Schumacher | The Racers Group (USA) | Kevin Buckler | Porsche | 996 GT3-R | | Porsche | GT |
| 71 | Thompson / Thompson / DeFontes / Brown | ACP Motorsports | | Chevrolet | Corvette | | Chevrolet | AGT |
| 72 | Murry / Lewis / Fisher / McGlynn | Jack Lewis Enterprises | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 73 | Jordan / Sumpter / Langford / Warnock | Team Eurotech (GB) | | Porsche | 996 GT3-R | | Porsche | GT |
| 74 | Baldwin / Robinson / Dallenbach, Jr. / Simo | Robinson Racing | | Riley & Scott | Mk III C | | Judd | SRP |
| 77 | Bouchut / Goueslard / Chéreau / Rosenblad | Larbre Competition (F) | | Chrysler | Viper | GTS-R | Chrysler | GTS |
| 78 | Roussel / Mirro / Krolowicz / O'Born / *Kumpen | Sezio Florida Racing Team | | Norma | M2000 | -01 | Ford | SRP |
| 79 | Fitzgerald / Jackson / Matos / Franchitti | J3 Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 82 | Greer / Willes / Lingner / Finger | Dick Greer Racing - Wendy's (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 83 | McKellar / Erdos / Johnson / Verdon-Roe | Graham Nash Motorsport (GB) | | Saleen | S7-R | | Ford | GTS |
| 84 | Herridge / Newton / Ellis / Attard | Graham Nash Motorsport (GB) | | Porsche | 996 GT3-R | | Porsche | GT |
| 85 | Orcutt / Haezebrouck / Bleustein / Croydon | Freisinger Motorsport (D) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 86 | Amorim / Dumas / Ortelli / Fertl | Freisinger Motorsport (D) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 87 | Roussel / Forgeois / Sezionale / *Mirro | Sezio Florida Racing Team (USA) | | Norma | M2000 | -02 | Ford | SRP |
| 89 | Julien / Wilson / Smith / *Merzon | Porschehaus Racing (CDN) | | Lola | B2K/40 | | Nissan | SRPII |
| 90 | Harvick / Carelli / Metcalf / Liniger | Flis Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 91 | Beilharz / Lisa / Jenkins | Paladin Racing | Bill Beilharz | Oldsmobile | Aurora | | | AGT |
| 92 | Casadei / Sangiuolo / Clark / Wilton | Swiss GT Racing (CH) | | Porsche | 996 GT3-R | | Porsche | GT |
| 93 | Smekalkin / van de Vyver / Morini / Krylov | Mastercar SRL | | Ferrari | F355 | | Ferrari | GT |
| 95 | Schroeder / Macaluso / Schneider / Volk | TRV Motorsport | | Riley & Scott | Mk III | | Chevrolet | SRP |
| 96 | Montermini / Polli / Bertoli / Zlobin | Mastercar SRL | | Ferrari | 360 Modena | GT | Ferrari | GT |
| 98 | Bes / Saviozzi / Thiel / Terrien | MAC Racing (I) | | Porsche | 996 GT3-R | | Porsche | GT |
| 99 | Wilson / Konig / Dawson / Hannen | Cirtek Motorsport (USA) | | Porsche | 996 GT3-R | | Porsche | GT |