| 1 | Lehto / Werner | ADT Champion Racing (USA) | Dave Maraj | Audi | R8 | | Audi | LMP1 |
| 2 | Pirro / Biela | ADT Champion Racing (USA) | Dave Maraj | Audi | R8 | | Audi | LMP1 |
| 3 | Fellows / O'Connell / Papis | Corvette Racing (USA) | Doug Fehan | Chevrolet | Corvette C6 | .R Z06 | Chevrolet | GT1 |
| 4 | Gavin / Beretta / Magnussen | Corvette Racing (USA) | Doug Fehan | Chevrolet | Corvette C6 | .R Z06 | Chevrolet | GT1 |
| 7 | Woodman / Forgeois / Johnson | BAT Competition (USA) | Ralph Thomas | Lola | B2K/40 | | AER | LMP2 |
| 8 | Bach / Cosmo / Forbes-Robinson | B-K Motorsports Inc. (USA) | Bob Bach/Pat Kestner | Courage | C65 | | Mazda | LMP2 |
| 10 | Bucknum / Gue / McMurry | Miracle Motorsports, Inc. (USA) | John Macaluso | Courage | C65 | | AER | LMP2 |
| 12 | Lewis / Willman | Autocon Motorsports (USA) | Michael Lewis | Riley & Scott | Mk III C | | Elan | LMP1 |
| 15 | Shimoda / *Chilton | Zytek Engineering (GB) | Trevor Foster | Zytek | 04S | | Zytek | LMP1 |
| 16 | Weaver / Wallace / Leitzinger | Dyson Racing Team (USA) | Rob Dyson | Lola | EX257 | | AER | LMP1 |
| 19 | Devlin / *van der Steur / *van der Steur | van der Steur Racing, Inc. (USA) | Gunnar Van der Steur | Lola | B2K/40 | | AER | LMP2 |
| 20 | Dyson / Smith | Dyson Racing Team (USA) | Rob Dyson | Lola | EX257 | | AER | LMP1 |
| 23 | Bernhard / Dumas | Alex Job Racing (USA) | Alex Job | Porsche | 996 GT3-RSR | | Porsche | GT2 |
| 24 | Baas / Collard / Tiemann | Alex Job Racing (USA) | Alex Job | Porsche | 996 GT3-RSR | | Porsche | GT2 |
| 27 | van de Poele / Theys | Horag-Lista Racing (CH) | Markus Hotz | Lola | B05/40 | -41 | Judd | LMP2 |
| 30 | Julian / Barazi / Bennett | Barazi Kruse-Motorsport (D) | Kai Kruse | Courage | C65 | | AER | LMP2 |
| 31 | Bergmeister / Long / *Stanton | Petersen Motorsports/White Lightning Racing (USA) | Michael Petersen | Porsche | 996 GT3-RSR | | Porsche | GT2 |
| 35 | Bertolini / Babini / de Simone | Maserati Corse (I) | Claudio Berro | Maserati | MC12 | | Maserati | GT1 |
| 37 | Field / Field / Halliday | Intersport Racing (USA) | Jon Field | Lola | B05/40 | | AER | LMP2 |
| 41 | Binnie / Timpany / Hancock | Binnie Motorsports (GB) | William Binnie | Lola | B05/40 | -42 | NME | LMP2 |
| 43 | Rockenfeller / Henzler / Jensen | BAM! (USA) | Tim Munday | Porsche | 996 GT3-RSR | | Porsche | GT2 |
| 44 | Pechnik / Neiman / *Murry | Flying Lizard Motorsports (USA) | Johannes van Overbeek | Porsche | 996 GT3-RSR | | Porsche | GT2 |
| 45 | Fogarty / Van Overbeek / Law | Flying Lizard Motorsports (USA) | Johannes van Overbeek | Porsche | 996 GT3-RSR | | Porsche | GT2 |
| 50 | Auberlen / Maxwell / Liddell | Panoz Motor Sports (USA) | Don Panoz | Panoz | Esperante | GTLM | Ford | GT2 |
| 51 | Sellers / Franchitti / Jeannette | Panoz Motor Sports (USA) | Don Panoz | Panoz | Esperante | GTLM | Elan | GT2 |
| 57 | Turner / Brabham / Kane | Aston Martin Racing (GB) | David Richards | Aston Martin | DBR9 | | Aston Martin | GT1 |
| 58 | Kox / Lamy / Enge | Aston Martin Racing (GB) | David Richards | Aston Martin | DBR9 | | Aston Martin | GT1 |
| 63 | Mowlem / Borcheller / Kelleners | ACEMCO Motorsports, LLC. (USA) | Jeff Giangrande | Saleen | S7-R | | Ford | GT1 |
| 71 | Weickardt / Belloc / Rugolo | Carsport America (USA) | Tom Weickardt | Dodge | Viper | GTS-R | Dodge | GT1 |
| 78 | Cawley / Burgess / Keen | J3 Racing, Inc. (USA) | Jaye M. Jackson | Porsche | 996 GT3-RS | | Porsche | GT2 |
| 79 | Sugden / Jönsson / Jackson | J3 Racing, Inc. (USA) | Jaye M. Jackson | Porsche | 996 GT3-RSR | | Porsche | GT2 |