| 00 | Morris / Teulan | Aussie Assault (AUS) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 01 | Pruett / Diaz / Briscoe | CompUSA Chip Ganassi with Felix Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 02 | McMurray / Johansson / Wagner | New Century Mtg/Chip Ganassi w/Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 03 | Mears / Dixon / Manning | Target Chip Ganassi with Felix Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 07 | Bob Ward | Spirit of Daytona Racing (USA) | Troy Flis | Crawford | DP03 | | Pontiac | DP |
| 08 | Goldin / Goldin / Finlay | Goldin Brothers Racing (USA) | Steve Goldin | Mazda | RX-8 | | Mazda | GT |
| 09 | Goad / Grégoire | Spirit of Daytona Racing (USA) | Troy Flis | Crawford | DP03 | | Pontiac | DP |
| 2 | Duno / Franchitti / Wheldon / Franchitti | CITGO - Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 3 | Grala / Patterson / Kroczek / Wahl | Cegwa Sport (USA) | | Fabcar | FDSC/03 | | Lexus | DP |
| 4 | Leitzinger / Forbes-Robinson / Johnson | Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 5 | Dyson / Dyson / Brix / Gue | Essex Racing (GB) | Mike Gue | Crawford | DP03 | | Ford | DP |
| 6 | Mears, Jr. / Borkowski / Connor / Dayton | Michael Shank Racing (USA) | Michael Shank | Riley | Mk XI | | Pontiac | DP |
| 8 | Frisselle / Frisselle | Rx.com/Synergy Racing (USA) | Cole Scrogham | Doran | JE4 | | BMW | DP |
| 9 | Skelton / Foster / Nyberg / Donner | Hyper Sport Engineering (USA) | | Doran | JE4 | | Infiniti | DP |
| 10 | Taylor / Collard / Angelelli | SunTrust Racing (USA) | | Riley | Mk XI | | Pontiac | DP |
| 11 | Plumb / Pinto / Michaelian / Boss | JMB Racing USA (USA) | | Ferrari | 360 Modena | Challenge | Ferrari | GT |
| 14 | Keen / Friedman / Johnson / Bacon | Autometrics Motorsports (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 16 | Coleman / Braun / Carrio / Bentley | TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 19 | McDowell / Gidley / Valiante / Bomarito | Ten Motorsports (USA) | Rob Finlay | Riley | Mk XI | | BMW | DP |
| 20 | Wallace / Lammers / Stewart | CITGO - Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 21 | Gleason / James / Auberlen / Hand | Prototype Technology Group (USA) | | BMW | M3 | E46 | BMW | GT |
| 22 | Marks / Valentine / Milner / Collins | Prototype Technology Group (USA) | | BMW | M3 | E46 | BMW | GT |
| 23 | Espenlaub / Szekeres / Hanson | Horizon Motorsports LLC (USA) | Jim Harrell | Pontiac | GTO | | Pontiac | GT |
| 25 | Cicero / McQueen / Bender | Westernesse Racing (USA) | | Crawford | DP03 | | Ford | DP |
| 29 | Vargo / Vargo / Vargo / Refenning | Brumos Racing (USA) | | Fabcar | FDSC/03 | | Porsche | DP |
| 35 | Levitas / Pobst / Fitzgerald / Matos | TPC Racing (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 36 | Littlechild / Pobst / Fitzgerald / Matos | TPC Racing (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 37 | Pumpelly / Matos / Fitzgerald / Pobst | TPC Racing (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 39 | Matthews / Goossens / Smith / Sharp | Orbit Racing (USA) | Rodger Hawley | Riley | Mk XI | | Pontiac | DP |
| 41 | Nonnamaker / Nonnamaker / Nonnamaker / Zitza / Blum / Lux / Allen / Gonzalez, Jr. | Orison-Planet Earth Motorsports (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 42 | Gonzalez, Jr. / Allen / Lux / Zitza / Nonnamaker | Orison-Planet Earth Motorsports (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 44 | Labonte / Herta / Magnussen | Doran Racing (USA) | Kevin Doran | Doran | JE4 | | Pontiac | DP |
| 46 | Baughman / Yeakle / Collyer / Stephens | Michael Baughman Racing (USA) | Michael Baughman | Chevrolet | Corvette | | Chevrolet | GT |
| 49 | Maxwell / Busch / Kenseth / Biffle | Multimatic Motorsports (USA) | | Multimatic | MDP1 | | Ford | DP |
| 50 | Nastasi / Bucknum | Blackforest Motorsports (USA) | | Multimatic | MDP1 | | Ford | DP |
| 54 | Tracy / Borcheller / Fittipaldi / Fittipaldi | Kodak - Bell Motorsports (USA) | | Doran | JE4 | | Pontiac | DP |
| 55 | Zach Arnold | ASC Motorsports (USA) | | Chevrolet | Corvette | | Chevrolet | GT |
| 58 | Donohue / Law / Luhr / Maassen | Brumos Racing (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 59 | France / Haywood / Rockenfeller | Brumos Racing (USA) | | Fabcar | FDSC/03 | | Porsche | DP |
| 61 | Lacey / Nearn / Shep / Wilkins / Wilkins | TRG East (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 62 | Inoue / Fujita / Takahashi / Hirakawa / Buckler | TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 63 | Master / Sluszny / Clark / Flanagan / Buckler | TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 64 | Amaral / Couceiro / Policastro, Jr. / Buckler | TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 65 | Buckler / Bunting / Lally / de Quesada | TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 66 | Papis / Bergmeister / Gavin | Krohn Racing/TRG (USA) | | Riley | Mk XI | | Pontiac | DP |
| 67 | Krohn / Jönsson / Rice / Said | Krohn Racing/TRG (USA) | | Riley | Mk XI | | Pontiac | DP |
| 69 | Jeannette / Brune | Gunnar Racing (USA) | Kevin Jeannette | Multimatic | MDP1 | | Ford | DP |
| 71 | Henzler / Farnbacher / Price / Ehret | Farnbacher Racing USA (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 74 | Robinson / Dallenbach, Jr. / Dallenbach | Robinson Racing (USA) | | Riley | Mk XI | | Lexus | DP |
| 75 | Pechnik / Van Overbeek / Neiman | Flying Lizard Motorsports (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 76 | Pechnik / Neiman / Van Overbeek | Flying Lizard Motorsports (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 77 | Bobbi / Gollin / Theys | Doran Racing (USA) | Kevin Doran | Doran | JE4 | | Lexus | DP |
| 78 | Phillips / Fairchild / Bonham / Williams | Farnbacher Racing USA (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 79 | Newman / Brockman | Newman Racing/Silverstone Racing (USA) | | Crawford | DP03 | | Ford | DP |
| 80 | Kitch / Gagne / Pallis / Pickering | Team Seattle/Synergy Racing (USA) | Kitch/Cole Scrogham | Porsche | 996 GT3 Cup | | Porsche | GT |
| 81 | Van Wijk / Murry / Gaylord / Emory | Team Seattle/Synergy Racing (USA) | | Porsche | 996 GT3 Cup | | Porsche | GT |
| 86 | Marshall / Marshall / Sellers / Urciuoli / Bohren | Synergy Racing (USA) | Cole Scrogham | Picchio | DP2 | | BMW | DP |
| 93 | Stewart / Stewart / Stewart | Apple Motorsports (USA) | Gary Stewart | Porsche | 996 GT3 Cup | | Porsche | GT |