| 01 | Pruett / Papis | CompUSA Chip Ganassi with Felix Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 02 | Morales / Diaz | CompUSA Chip Ganassi with Felix Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 07 | Camirand / Guindon | Powell Motorsport (CDN) | Devon Powell | Chevrolet | Corvette | Z06 | Chevrolet | SGS |
| 09 | Goad / Grégoire | Spirit of Daytona Racing (USA) | Troy Flis | Crawford | DP03 | | Pontiac | DP |
| 2 | Duno / Wallace / Lammers | Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 3 | Grala / Lloyd / Borkowski | Cegwa Sport (USA) | Darius Grala | Fabcar | FDSC/03 | | Lexus | DP |
| 4 | Leitzinger / Forbes-Robinson / *Edwards | Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 5 | Pruskowski / Pruskowski / Bentley | Essex Racing (USA) | Mike Gue | Multimatic | MDP1 | | Ford | DP |
| 6 | Negri / Frisselle | Michael Shank Racing (USA) | Michael Shank | Doran | JE4 | | Lexus | DP |
| 7 | Lewis / Rice / *Southard | Southard Motorsports (USA) | Steve Southard | Fabcar | FDSC/03 | | BMW | DP |
| 10 | Angelelli / Taylor / Collard | SunTrust Racing (USA) | Wayne Taylor | Riley | Mk XI | | Pontiac | DP |
| 11 | Alexander / Gay / Mediani | JMB Racing USA (USA) | Jean-Michel Bouresche | Ferrari | 360 Modena | N-GT | Ferrari | GT |
| 12 | Said / Auberlen | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 GT | BMW | GT |
| 21 | Said / Auberlen | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 22 | Hand / Marks | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 27 | Magnussen / Theys | Doran Lista Racing (USA) | Kevin Doran | Doran | JE4 | | Lexus | DP |
| 33 | Barbosa / Assentato / Earle | Scuderia Ferrari of Washington (USA) | Allie Ash, Jr. | Maserati | Trofeo Light | | Maserati | GT |
| 36 | Pobst / Levitas / *Maxwell | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 37 | Adam / Littlechild | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 38 | Lally / Bunting | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 39 | Hall / Huang / Davis | Silverstone Racing Services (USA) | Larry Huang/Chris Hall | Crawford | DP03 | | Pontiac | DP |
| 41 | Nonnamaker / Nonnamaker / Nonnamaker | Orison-Planet Earth Motorsports (USA) | Joe Nonnamaker | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 44 | Fitzgerald / Policastro, Jr. / Policastro | Orbit Racing (USA) | Rodger Hawley | Porsche | 996 GT3-RS | | Porsche | GT |
| 46 | Martin / Yeakle / St. Amour | Michael Baughman Racing (USA) | Michael Baughman | Chevrolet | Corvette | Z06 | Chevrolet | SGS |
| 47 | Ward / Baughman | Michael Baughman Racing (USA) | Michael Baughman | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 47T | Ward / Baughman / *Nonnamaker / *Nonnamaker | Orison-Planet Earth Motorsports (USA) | Michael Baughman | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 54 | Pilgrim / Barber / Borcheller | Kodak - Bell Motorsports (USA) | James Bell | Doran | JE4 | | Pontiac | DP |
| 57 | Vance / McQueen / Schuitemaker | Stevenson Motorsports/Auto Assets (USA) | John Stevenson | Porsche | 996 GT3-R | | Porsche | GT |
| 58 | Donohue / Law / Maassen | Red Bull - Brumos - Goodyear - Kendall (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 59 | France / Luhr / Haywood | Brumos - Goodyear - Kendall (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 62 | Halsmer / Schmitt | Honda of America Racing Team (USA) | Kyle David Koestner | Acura | NSX | | Acura | GT |
| 66 | James / Valentine / Gleason | The Racers Group (USA) | Kevin Buckler | Porsche | 996 GT3-RS | | Porsche | GT |
| 67 | Buckler / Halliday / Kroczek | The Racers Group (USA) | Kevin Buckler | Porsche | 996 GT3-RS | | Porsche | GT |
| 71 | Wilkins / Lacey / *Wilden | Doncaster Racing (CDN) | John Lacey | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 77 | Pumpelly / Liddell / Greenberg | G&W Motorsports (USA) | Mark Greenberg | Porsche | 996 GT3-RS | | Porsche | GT |
| 80 | Guenette / Guenette / *Letourneau | G&W Motorsports (USA) | Cole Scrogham | Picchio | DP2 | | BMW | DP |
| 81 | Wagner / Martini / Collins | Rx.com/G&W Motorsports (USA) | Cole Scrogham | Doran | JE4 | | BMW | DP |
| 85 | Stroll / Longhi / Rehm | Falcon Racing (CDN) | Lawrence Stroll | Ferrari | 360 Modena | GT | Ferrari | GT |
| 86 | Murry / Van Wijk / Krohn | G&W Motorsports (USA) | Cole Scrogham | Porsche | 996 GT3 Cup | I | Porsche | SGS |
| 91 | Dumoulin / Julien / Long | Doncaster Racing (CDN) | John Lacey | Porsche | 996 GT3 Cup | | Porsche | SGS |