| 03 | Euser / Knook / Crevels / Van der Kolk | Marcos USA | | Marcos | Mantis | Plus | Ford | GT |
| 05 | Conway / Metcalf / Carelli / Liniger | RE/MAX Racing | | Chevrolet | Corvette | | Chevrolet | GTS |
| 09 | Goad / Menard / Mears, Jr. / Briody | Flis Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | GTS |
| 3 | Grala / Negri / Rehm / Cosmo | Cegwa Sport (USA) | | Fabcar | FDSC/03 | | Toyota | DP |
| 5 | Bentley / Kitch / Pruskowski / Pruskowski | Team Seattle/Essex Racing (USA) | | Lola | B2K/40 | | Nissan | SRPII |
| 6 | Jeannette / *Dayton / *Kitchak / *Zitza | Gunnar Racing (USA) | | Porsche | 911 GT1 | | Porsche | GTS |
| 7 | Konrad / Seiler / Dare / Yvon | Konrad Motorsport (D) | | Saleen | S7-R | | Ford | GTS |
| 8 | Said / Law / Quester / Riccitelli | G&W Motorsports (USA) | | Picchio | DP2 | | BMW | DP |
| 10 | Terrien / Delalande / de Lorenzi / Saviozzi | MAC Racing (I) | | Porsche | 996 GT3-R | | Porsche | GT |
| 15 | Gaughran / Gorriaran / MacLeod / Gaylord | Team Seattle/Essex Racing | | Lola | B2K/40 | | Nissan | SRPII |
| 18 | Stiver / *Deware / *Bell / *Kline | Boston Motorsports Group | | Mosler | MT900 | R | Chevrolet | GTS |
| 19 | Puleo / Hitt / Dubler / Kennedy | ACP Motorsports | | Chevrolet | Corvette | | Chevrolet | GTS |
| 20 | Farfus / Collard / Papis / Garbagnati | JMB USA Racing (USA) | | Ferrari | 360 Modena | N-GT | Ferrari | GT |
| 21 | Oberto / Bingham / Cope / DeVries | Archangel Motorsport Services (USA) | Michael Johnson | Lola | B2K/40 | | Nissan | SRPII |
| 22 | Earle / *Shearer / *Grégoire / *Manfredi | JMB USA Racing (USA) | | Ferrari | 360 Modena | N-GT | Ferrari | GT |
| 24 | Policand / Barbosa / Neugarten / Wallace | Perspective Racing (F) | | Mosler | MT900 | R | Chevrolet | GTS |
| 30 | Short / Herridge / Burton / Shep | Rollcentre Racing (GB) | Martin Short | Mosler | MT900 | R | Chevrolet | GTS |
| 31 | Stanton / Barff / Britnell / Sutherland | Rollcentre Racing (GB) | Martin Short | Mosler | MT900 | R | Chevrolet | GTS |
| 33 | Wagner / Martini / Tremblay / Wellman | Scuderia Ferrari of Washington | | Ferrari | 360 Modena | GT | Ferrari | GT |
| 34 | Baldi / Keen / van de Poele / Hampton | Ferri Competizione | | Ferrari | 360 Modena | GT | Ferrari | GT |
| 35 | Kelleners / Lazzaro / Mowlem | Risi Competizione (USA) | | Ferrari | 360 Modena | GT | Ferrari | GT |
| 40 | Bell / Wilden / Bell / Gregg | Derhaag Motorsports | | Chevrolet | Corvette C5 | | Chevrolet | GTS |
| 43 | Baron / Hindery / Lieb / Petty | Orbit Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 44 | Fitzgerald / Matos / Policastro / Policastro, Jr. | Orbit Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 46 | Morgan / Norick / Pace / Morgan | Morgan-Dollar Motorsports | | Chevrolet | Corvette | | Chevrolet | GTS |
| 48 | Riggins / Machavern / *Lepage / *Lagasse | Heritage Motorsports (USA) | | Ford | Mustang | | Ford | GTS |
| 49 | Orlandi / Merendino / Clark / Atapattu | Pit Bull/MAC Racing (I) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 51 | Casadei / *Ried / *Ried / *Jurasz | Proton Competition (D) | Gerold Ried | Porsche | 993 GT2 | | Porsche | GTS |
| 54 | Theys / Barber / Borcheller / Fittipaldi | Bell Motorsports (USA) | | Doran | JE4 | | Chevrolet | DP |
| 57 | Caffi / Rosa / Chiesa / Rosa | Seikel Motorsport (D) | Peter Seikel | Porsche | 996 GT3-RS | | Porsche | GT |
| 58 | Donohue / Borkowski / Pobst / Bye | Brumos Porsche (USA) | | Fabcar | FDSC/03 | | Porsche | DP |
| 59 | France / Haywood / Goodyear / Sharp | Brumos Porsche (USA) | | Fabcar | FDSC/03 | | Porsche | DP |
| 61 | van Merksteijn / Brugman / Munsterhuis / Jacobsen | System Force Motorsports (NL) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 66 | Buckler / Schrom / Bernhard / Bergmeister | The Racer's Group (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 67 | Davis / Julien / Nastasi / Lacey | The Racer's Group (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 68 | Michaelian / Valentine / Hessert, III / Hessert | The Racer's Group (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 69 | Cunningham / Plumb / Friedman / Stanton | Marcus Racing (USA) | | BMW | M3 | E36 | BMW | GT |
| 73 | Wilson / Newton / Gooding / Konig | Graham Nash Motorsport (GB) | | Porsche | 996 GT3-R | | Porsche | GT |
| 77 | Vasiliev / Tanaka / Fomenko / Lechner, Jr. | RWS Motorsport (D) | | Porsche | 996 GT3-R | | Porsche | GTS |
| 80 | Bayliff / Marshall / Prilika / *Lally | G&W Motorsports | | Picchio | D-USA | | BMW | SRPII |
| 83 | Murry / Standridge / Van Overbeek / Steranka | Rennwerks Motorsports (USA) | | Porsche | 996 GT3-R | | Porsche | GT |
| 88 | Maxwell / Brabham / Empringham | Multimatic | | Multimatic | MDP1 | | Ford | DP |
| 97 | Savoldi / Peroni / Francioni | Lucchini Engineering (I) | | Lucchini | SR2002 | | Nissan | SRPII |
| 98 | Maassen / Snow / Luhr / Schumacher | Schumacher Racing (USA) | | Porsche | 996 GT3-RS | | Porsche | GT |
| 99 | Hamblin / Brensinger / Nelson / Greenberg | NETTTS Racing | | Porsche | 996 GT3-RS | | Porsche | GT |