| 01 | Guenette / Guenette / *Guenette, Jr. | D.L.G.L. Racing (CDN) | | Porsche | 993 Carrera | 2 | Porsche | GTS |
| 03 | James / Lassally / *Pobst | Marcos Racing International USA | | Marcos | Mantis | Plus | Ford | GT |
| 04 | Euser / Orti / Jacobsen | Marcos Racing International USA | | Marcos | Mantis | Plus | Ford | GT |
| 07 | Law / Lally / Bayliff | G&W Motorsports | | Picchio | D-USA | | BMW | SRPII |
| 09 | Nonnamaker / *Goad | Flis Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 5 | Bingham / Mall | Park Place Racing (USA) | | Saleen | S7-R | | Ford | GTS |
| 6 | Rice / Macaluso / Gue | Miracle Motorsports (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 7 | Jönsson / Franchitti / Rand | Rand Racing/Risi Competizione (USA) | Bill Rand/Giuseppe Risi | Lola | B2K/40 | | Nissan | SRPII |
| 8 | Kelleners / Borcheller / Lazzaro | Rand Racing/Risi Competizione (USA) | | Lola | B2K/40 | | Nissan | SRPII |
| 9 | Dobyns / *Chase / *Friedman | Marcus Motorsports | | BMW | M3 | E36 | BMW | GT |
| 10 | Gleason / Assentato / Longhi | Alegra Motorsports/901 Shop (USA) | Emil Assentato | BMW | M3 | E46 GT | BMW | GT |
| 11 | Bupp / Davis | Hamilton Safe/Inside Track Motorsports (USA) | | Chevrolet | Camaro | | Chevrolet | AGT |
| 14 | Merzon / Soriano / Wilson | Pharmacydirectusa.com Racing | | Porsche | 996 GT3-R | | Porsche | GTS |
| 16 | Weaver / Dyson | Dyson Racing Team (USA) | | Riley & Scott | Mk III | Series 2 | Ford | SRP |
| 19 | Hitt / *Trinkler / *Mills | ACP Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 20 | Leitzinger / Dyson / Forbes-Robinson | Dyson Racing Team (USA) | | Riley & Scott | Mk III | | Ford | SRP |
| 22 | Sterenberg / Arsenault / MacLeod | Archangel Motorsport Services (USA) | Michael Johnson | Lola | B2K/40 | | Nissan | SRPII |
| 24 | Barbosa / Perrier | Perspective Racing (F) | | Mosler | MT900 | R | Chevrolet | GT |
| 26 | Whitehead / Zacharias / *Giangrande | ACEMCO Motorsports | | Porsche | 996 GT3-RS | | Porsche | GT |
| 27 | Theys / Lienhard, Jr. / Baldi | Doran Lista Racing (USA) | | Dallara | SP1 | | Judd | SRP |
| 29 | Curran / *Brassfield / *Hoerr | Sky Blue Racing | | Ford | Mustang | | Ford | AGT |
| 33 | Wagner / Auberlen | Scuderia Ferrari of Washington (USA) | | Ferrari | 360 Modena | GT | Ferrari | GT |
| 34 | Pumpelly / Ivankovich / Sherman | ZIP Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 40 | Gabel / de Quesada / Neuman | Alegra Motorsports (USA) | | BMW | M3 | E46 GT | BMW | GT |
| 46 | Richards / *Richards / *Setzer | Morgan Dollar Motorsports | | Chevrolet | Corvette | | Chevrolet | AGT |
| 47 | Morgan / Morgan | Morgan Dollar Motorsports | | Chevrolet | Corvette | | Chevrolet | AGT |
| 48 | Riggins / Machavern | Heritage Motorsports (USA) | | Ford | Mustang | | Ford | AGT |
| 52 | Gaffney / *Paqua / *Kraus | Powerslide Motorsports | | Kudzu | DLM | | Buick | SRP |
| 54 | Murry / Valentine | Bell Motorsports | | BMW | M3 | E46 GT | BMW | GT |
| 64 | Kuttner / Calvet | Pegasus Racing (USA) | | Lola | B2K/10 | | Porsche | SRP |
| 66 | Buckler / Schrom / Morton | The Racer's Group (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 72 | Fisher / Lewis | Jack Lewis Enterprises | | Porsche | 996 GT3 Cup | | Porsche | GTS |
| 75 | Policastro, Jr. / Policastro | Classic Motorsports/Gunnar Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 81 | Martini / Law | G&W Motorsports (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 83 | Giersing / Steranka / Standridge | Rennwerks Motorsports (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 87 | Roussel / Forgeois / *Sezionale | Sezio Florida Racing Team (USA) | | Norma | M2000 | -02 | Ford | SRP |
| 90 | Goad / Briody / Kopperl | Flis Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | AGT |
| 91 | Brannon / Lisa / Rosenblum | Paladin Racing | | Chevrolet | Corvette | | Chevrolet | AGT |