| 01 | Pruett / Diaz | CompUSA Chip Ganassi with Felix Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 02 | Johansson / Wagner | New Century Mtg/Chip Ganassi w/Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 04 | Alhadeff / Sigal | Sigalsport (USA) | Gene Sigal | Porsche | 996 GT3 Cup | | Porsche | GT |
| 05 | Sigal / Alhadeff | Sigalsport (USA) | Gene Sigal | Porsche | 996 GT3 Cup | | Porsche | GT |
| 07 | Moreno / Ward / Zogaib | Spirit of Daytona Racing (USA) | Troy Flis | Crawford | DP03 | | Pontiac | DP |
| 09 | Goad / Grégoire / Camirand | Spirit of Daytona Racing (USA) | Troy Flis | Crawford | DP03 | | Pontiac | DP |
| 2 | Duno / Wallace / Lammers | CITGO - Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 3 | Lewis / Grala | Southard Motorsports (USA) | Darius Grala | Riley | Mk XI | | BMW | DP |
| 4 | Forbes-Robinson / Leitzinger | Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 5 | Pruskowski / Pruskowski / Bentley | Essex Racing (USA) | Mike Gue | Crawford | DP03 | | Ford | DP |
| 6 | Borkowski / Dayton / Wilden | 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 |
| 10 | Angelelli / Taylor | SunTrust Racing (USA) | Wayne Taylor | Riley | Mk XI | | Pontiac | DP |
| 14 | Friedman / Keen / Patch | Autometrics Motorsports (USA) | Cory Friedman | Porsche | 996 GT3 Cup | | Porsche | GT |
| 15 | Guenette / Guenette / Bingham | CB Motorsports (USA) | Chris Bingham | Riley | Mk XI | | Lexus | DP |
| 16 | Hand / Milner / Marks | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 19 | Gidley / McDowell | Finlay Motorsports (USA) | Rob Finlay | Riley | Mk XI | | BMW | DP |
| 21 | Collins / Valentine / Auberlen | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 22 | James / Hand / *Gleason | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 23 | Szekeres / Weinberg / Del Vecchio | Horizon Motorsports LLC (USA) | Jim Harrell | Pontiac | GTO | | Pontiac | GT |
| 33 | Segal / Barbosa | Ferrari of Washington (USA) | Allie Ash, Jr. | Maserati | Trofeo Light | | Maserati | GT |
| 35 | Longhi / Assentato | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 36 | Dumoulin / Levitas / Plumb | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 37 | Pumpelly / *Littlechild | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 38 | Fitzgerald / Matos | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 39 | Smith / *Matthews / *Tiemann | Orbit (USA) | Rodger Hawley | Riley | Mk XI | | Pontiac | DP |
| 41 | Nonnamaker / Lux | Team Sahlen (USA) | Joe Nonnamaker | Porsche | 996 GT3 Cup | | Porsche | GT |
| 42 | Nonnamaker / Nonnamaker | Team Sahlen (USA) | Joe Nonnamaker | Porsche | 996 GT3 Cup | | Porsche | GT |
| 43 | Nonnamaker / Nonnamaker | Team Sahlen (USA) | Joe Nonnamaker | Porsche | 996 GT3 Cup | I | Porsche | GT |
| 54 | Kelleners / Borcheller | Kodak - Bell Motorsports (USA) | James Bell | Doran | JE4 | | Pontiac | DP |
| 58 | Donohue / Maassen / Law | Red Bull/Brumos Racing (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 59 | France / Luhr / Haywood | Brumos Racing (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 61 | Stroll / Rehm / Courey | TRG East (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 63 | Brumbaugh / Bullock / Master | Auto Gallery/TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 65 | Lally / Bunting | Auto Gallery/TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 66 | Bergmeister / Fittipaldi | Krohn Racing/TRG (USA) | Krohn/Buckler | Riley | Mk XI | | Pontiac | DP |
| 67 | Jönsson / *Krohn | Krohn Racing/TRG (USA) | Krohn/Buckler | Riley | Mk XI | | Pontiac | DP |
| 71 | Lazzaro / Lieb / *Greenberg | SAMAX (USA) | Peter Baron | Porsche | 996 GT3 Cup | | Porsche | GT |
| 73 | Davis / Tafel / Gue | Tafel Racing (USA) | Tony Dowe | Porsche | 996 GT3 Cup | | Porsche | GT |
| 77 | Gollin / Bobbi | Doran Racing (USA) | Kevin Doran | Doran | JE4 | | Lexus | DP |
| 80 | Murry / Stanton / *Van Wijk | Synergy Racing (USA) | Cole Scrogham | Porsche | 996 GT3 Cup | | Porsche | GT |
| 81 | Van Wijk / Cobb | Synergy Racing (USA) | Cole Scrogham | Porsche | 996 GT3 Cup | | Porsche | GT |
| 89 | Stroll / *Courey / *Rehm | Falcon Racing (USA) | Lawrence Stroll | Ferrari | 360 Modena | Challenge | Ferrari | GT |
| 96 | McKenzie / Mortimer / Kroczek | Eurosport Racing (USA) | Tim McKenzie | Porsche | 996 GT3 Cup | | Porsche | GT |