| 01 | Papis / Pruett | 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 |
| 03 | Alfonso / Traver | Grease Monkey Racing (USA) | Gene Sigal | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 04 | Sigal / Brix | Grease Monkey Racing (USA) | Gene Sigal | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 09 | Grégoire / Goad | Spirit of Daytona Racing (USA) | Troy Flis | Crawford | DP03 | | Pontiac | DP |
| 2 | Duno / Wallace | CITGO - Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 4 | Forbes-Robinson / Leitzinger | Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 6 | Negri / Frisselle | Michael Shank Racing (USA) | Michael Shank | Doran | JE4 | | Lexus | DP |
| 7 | Lewis / Rice | Southard Motorsports (USA) | Steve Southard | Fabcar | FDSC/03 | | BMW | DP |
| 8 | Manning / Dixon | CompUSA Chip Ganassi with Felix Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 10 | Taylor / Angelelli | SunTrust Racing (USA) | Wayne Taylor | Riley | Mk XI | | Pontiac | DP |
| 16 | Milner / Collins | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 18 | Guenette / Miller | Chase Competition Engineering (USA) | Robert Chase | Chase | CCE-001 | | Chevrolet | DP |
| 21 | Auberlen / Marks | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 22 | Said / Hand | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 23 | Del Vecchio / McKenzie / Espenlaub | Horizon Motorsports LLC (USA) | Jim Harrell | Pontiac | GTO | | Pontiac | GT |
| 27 | Theys / Magnussen | Doran Lista Racing (USA) | Kevin Doran | Doran | JE4 | | Lexus | DP |
| 31 | Borkowski / Nolte | Margraf Racing (USA) | Bill Margraf | Riley | Mk XI | | Pontiac | DP |
| 32 | Davis / *Bell | ACS Express Racing (USA) | Mike Davis | Saleen | Mustang | | Ford | SGS |
| 33 | Assentato / Earle | Scuderia Ferrari of Washington (USA) | Allie Ash, Jr. | Maserati | Trofeo Light | | Maserati | GT |
| 34 | Segal / Buchwald | Scuderia Ferrari of Washington (USA) | Allie Ash, Jr. | Maserati | Trofeo Light | | Maserati | GT |
| 35 | West / Faieta | Scuderia Ferrari of Washington (USA) | Allie Ash, Jr. | Ferrari | 360 Modena | GT | Ferrari | GT |
| 36 | Levitas / Pobst | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 37 | Littlechild / Dumoulin | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 38 | Bunting / Lally | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 41 | Nonnamaker / Nonnamaker / *Nonnamaker | Orison-Planet Earth Motorsports (USA) | Joe Nonnamaker | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 46 | Hanson / Yeakle | 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 |
| 54 | Fittipaldi / Borcheller | Kodak - Bell Motorsports (USA) | James Bell | Doran | JE4 | | Pontiac | DP |
| 57 | Cicero / McQueen / *Vance | Stevenson Motorsports/Auto Assets (USA) | John Stevenson | Porsche | 996 GT3-R | | Porsche | GT |
| 58 | Law / Donohue | Red Bull - Brumos - Goodyear - Kendall (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 59 | France / Haywood | Brumos - Goodyear - Kendall (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 62 | Schmitt / *Halsmer | Honda of America Racing Team (USA) | Kyle David Koestner | Acura | NSX | | Acura | GT |
| 63 | Escalette / *Plumb | Stuttgart Performance (USA) | Glenn Yee | Porsche | 996 GT3 Cup | | Porsche | SGS |
| 66 | Valentine / James / Gleason | The Racers Group (USA) | Kevin Buckler | Porsche | 996 GT3-RS | | Porsche | GT |
| 67 | Buckler / Flanagan | The Racers Group (USA) | Kevin Buckler | Porsche | 996 GT3-RS | | Porsche | GT |
| 77 | Greenberg / Pumpelly | G&W Motorsports (USA) | Cole Scrogham | Porsche | 996 GT3-RS | | Porsche | GT |
| 81 | Martini / Wagner | Rx.com/G&W Motorsports (USA) | Cole Scrogham | Doran | JE4 | | BMW | DP |
| 86 | Van Wijk / Stanton | G&W Motorsports (USA) | Cole Scrogham | Porsche | 996 GT3 Cup | I | Porsche | SGS |