| 0 | Bytzek / Holtom / Bytzek | Bytzek Motorsports (CDN) | | Porsche | 911 GT1 | Evo | Porsche | GTS |
| 00 | Bytzek / Holtom / Bytzek | Bytzek Motorsports (CDN) | | Porsche | 911 GT1 | Evo | Porsche | GTS |
| 03 | France / Lassally / Euser / Pasteryak / Arpin / Devlin | Marcos Racing International | | Marcos | Mantis | Plus | Ford | GT |
| 05 | Jeff Bucknum | Team Bucknum Racing (USA) | | Pilbeam | MP84 | | Nissan | SRPII |
| 06 | Jacobs / Duder / Paul, Jr. | Jacobs Motorsports (USA) | Michael Jacobs | Riley & Scott | Mk III | | Ford | SRP |
| 06T | Frank Del Vecchio | Jacobs Motorsports | | Kudzu | DLM-4 | | Chevrolet | SRP |
| 07 | Marshall / Law | G&W Motorsports | | Picchio | D-USA | | BMW | SRPII |
| 09 | Conway / Goad / Ciasulli | Flis Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 2 | Lammers / Stewart / Mowlem | Crawford Racing | | Crawford | SSC2K | | Judd | SRP |
| 3 | Gentilozzi / Lauer | Rocketsports Racing (USA) | Paul Gentilozzi | Jaguar | XKR | | Ford | GTS |
| 6 | Macaluso / Rice / Gue / Lally / Oberto / Sherman | Miracle Motorsports (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 8 | Rand / Lazzaro / Borcheller / Kelleners | Rand Racing/Risi Competizione (USA) | Bill Rand/Giuseppe Risi | Lola | B2K/40 | | Nissan | SRPII |
| 10 | Assentato / Longhi / Snyder / Fairbanks | Genesis (USA) | Emil Assentato | BMW | M3 | E46 GT | BMW | GT |
| 12 | Mall / Smith / Dwyer / Scarallo | K&N Filters Racing | | Ultima | GTR | | Chevrolet | GTS |
| 16 | Weaver / Leitzinger / Gavin / Dyson / Dyson | Dyson Racing Team (USA) | | Riley & Scott | Mk III | Series 2 | Ford | SRP |
| 17 | Blacker / Adams | A&B Motorsports (USA) | | Pilbeam | MP84 | | Nissan | SRPII |
| 19 | Zwart / Collins / Bell | Team Ascari (GB) | | Ascari | KZR-1 | | BMW | SRP |
| 20 | Dyson / Schroeder / Dyson | Dyson Racing Team (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 21 | Clinton / Tillman / Francois / Connor / Lally | Archangel Motorsport Services (USA) | Michael Johnson | Lola | B2K/40 | | Nissan | SRPII |
| 22 | Knight / Block | Archangel Motorsport Services (USA) | Michael Johnson | Lola | B2K/40 | | Nissan | SRPII |
| 24 | Neugarten / Barbosa | Perspective Racing (F) | | Mosler | MT900 | R | Chevrolet | GT |
| 26 | Giangrande / Whitehead / Zacharias / Davis | ACEMCO Motorsports LLC | | Mosler | MT900 | R | Chevrolet | GT |
| 27 | Lienhard, Jr. / Theys / Papis / Baldi | Doran Lista Racing (USA) | | Dallara | SP1 | | Judd | SRP |
| 28 | Ziegelman / James / Steiner / Lloyd | Blackforest Motorsports Group | | Riley & Scott | Mk III | | Ford | SRP |
| 29 | Hoerr / Brassfield / Busch / Duncan | Sky Blue Racing | | Ford | Mustang | | Ford | AGT |
| 32 | Goldin / Goldin / Finlay | Goldin Brothers Racing | | Mazda | RX-7 | | Mazda | GT |
| 33 | Wagner / Bertuzzi / Murry | Scuderia Ferrari Of Washington (USA) | | Ferrari | 360 Modena | N-GT | Ferrari | GT |
| 34 | Pumpelly / Valentine / Dilorio / Green | ZIP Racing | | Porsche | 996 GT3-R | | Porsche | GT |
| 35 | Ivankovich / Pumpelly / Valentine / Pobst / Hiskey | ZIP Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 36 | Matthews / Smith / Sharp / Gordon | Jim Matthews Racing (USA) | | Riley & Scott | Mk III C | | Elan | SRP |
| 37 | Field / Field / Durand / Dayton | Intersport Racing (USA) | | Lola | B2K/10 | B | Judd | SRP |
| 38 | Haywood / Maassen / Wallace / Luhr | Champion Racing (USA) | | Lola | B2K/10 | | Porsche | SRP |
| 39 | Papadopoulos / Friedman / Plumb | Autosport Race Team | | Porsche | 996 GT3-R | | Porsche | GT |
| 40 | de Quesada / Refenning / Jones / Vargo | Alegra Motorsports/901 Shop (USA) | | BMW | M3 | E46 GT | BMW | GT |
| 42 | Byrne / Millman / Martinez | Team Greeneman (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 43 | Hindery / Petty / Borkowski / Baron | Orbit (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 44 | Schultheis / Kester / Tremblay / Wellman | Orbit (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 45 | Gregg / Bunting / Fairbanks / Lewis | American Viper Racing (USA) | | Dodge | Viper | GTS-R | Dodge | GTS |
| 46 | Hitt / Nauwert | ACP Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 47 | Richards / Richards / Morgan / Morgan | Morgan Dollar Motorsports | | Chevrolet | Corvette | | Chevrolet | AGT |
| 49 | Lupberger / Bell / Zwart | Team Ascari (GB) | | Ascari | KZR-1 | | Judd | SRP |
| 50 | Hajducky / Stanton / Suzuki / Quiros / Valentine | Aasco - Boduck Racing | Dennis Aase | BMW | M3 | E46 GT | BMW | GT |
| 51 | Bingham / MacLeod / Gaughran / Gaylord | Park Place Racing/Team Seattle | | Saleen | S7-R | | Ford | GTS |
| 52 | Gaffney / Paqua / Kraus | Powerslide Motorsports | | Kudzu | DLM | | Buick | SRPII |
| 53 | Kitch / Bingham / Solomon / Valencia | Park Place Racing/Team Seattle (USA) | | Saleen | S7-R | | Ford | GTS |
| 54 | Cunningham / Borcheller / Atapattu / Talbert / van de Merwe / Petery | Bell Motorsports | | BMW | M3 | E46 GT | BMW | GT |
| 56 | Rosa / Drudi | Seikel Motorsport (D) | Peter Seikel | Porsche | 996 GT3-RS | | Porsche | GT |
| 57 | Collin / Shep / Franchitti | Seikel Motorsport (D) | Peter Seikel | Porsche | 996 GT3-RS | | Porsche | GT |
| 63 | Downing / Ronson / Nearburg | Downing Atlanta Inc. (USA) | Jim Downing | Kudzu | DLY | | Mazda | SRP |
| 66 | Buckler / Schrom / Bernhard / Bergmeister | The Racer's Group (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 67 | Michaelian / Manfredi / Daniels / McGlynn / Bye | The Racer's Group (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 68 | Buckler / Talbert / Wilson / Gooding / Dawson / Hannen | The Racer's Group (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 74 | Baldwin / Robinson / Knapp | Robinson Racing | | Riley & Scott | Mk III C | | Judd | SRP |
| 77 | Newman / Brockman | Newman Racing (USA) | | Panoz | Esperante | | Ford | GTS |
| 79 | Fitzgerald / Matos / Jackson | J3 Racing | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 90 | Carelli / Liniger / Metcalf / Harvick | Flis Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 95 | Schroeder / Volk / Schneider / Macaluso | TRV Motorsport | | Riley & Scott | Mk III | | Chevrolet | SRP |
| 153 | Scheuren / Rankin / Curran | Diablo (USA) | Ellen Barbara | Chevrolet | Camaro | IV | Chevrolet | AGT |
| 178 | Fitzgerald / Matos / Jackson | J3 Racing | | Porsche | 993 Cup | RSR | Porsche | GT |