| 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 |
| 05 | Alhadeff / Sigal | Sigalsport (USA) | Gene Sigal | Porsche | 996 GT3 Cup | | Porsche | GT |
| 06 | Dyson / Brix / Dyson | Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 07 | Ward / Moreno / Zogaib | Spirit of Daytona Racing (USA) | Troy Flis | Crawford | DP03 | | Pontiac | DP |
| 09 | Goad / Grégoire | 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 | Leitzinger / Forbes-Robinson | Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 5 | Goeters / Nastasi / Cicero | Essex Racing (USA) | Mike Gue | Crawford | DP03 | | Ford | DP |
| 6 | Borkowski / Mears, Jr. / 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 |
| 10 | Angelelli / Taylor | SunTrust Racing (USA) | Wayne Taylor | Riley | Mk XI | | Pontiac | DP |
| 14 | Henzler / Keen / Friedman | Autometrics Motorsports (USA) | Cory Friedman | Porsche | 996 GT3 Cup | | Porsche | GT |
| 15 | Bingham / Guenette / Guenette | CB Motorsports (USA) | Chris Bingham | Riley | Mk XI | | Lexus | DP |
| 16 | Milner / Marks / *Valentine | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 19 | McDowell / Gidley | Finlay Motorsports (USA) | Rob Finlay | Riley | Mk XI | | BMW | DP |
| 21 | Auberlen / Collins / Hand | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 22 | James / Gleason / Said | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 23 | Szekeres / Espenlaub / Weinberg | Horizon Motorsports LLC (USA) | Jim Harrell | Pontiac | GTO | | Pontiac | GT |
| 30 | Plumb / de Quesada / *Jones | Alegra Motorsports (USA) | Carlos DeQuesada | Porsche | 996 GT3 Cup | | Porsche | GT |
| 33 | Segal / Barbosa | Ferrari of Washington (USA) | Allie Ash, Jr. | Maserati | Trofeo Light | | Maserati | GT |
| 35 | Longhi / Assentato / *Plumb | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 36 | Pobst / Levitas | 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 / Tiemann | Orbit (USA) | Rodger Hawley | Riley | Mk XI | | Pontiac | DP |
| 41 | Nonnamaker / Fisher / *Nonnamaker / *Nonnamaker | Team Sahlen (USA) | Joe Nonnamaker | Porsche | 996 GT3 Cup | | Porsche | GT |
| 42 | Will 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 / *Barber | Kodak - Bell Motorsports (USA) | James Bell | Doran | JE4 | | Pontiac | DP |
| 55 | Miller / Workman / Arnold | ASC Motorsports (USA) | Zach Arnold | Chevrolet | Corvette | | Chevrolet | GT |
| 57 | Riggins / Baughman | Stevenson Motorsports (USA) | Stevenson/Southard | Chevrolet | Corvette | | Chevrolet | GT |
| 58 | Law / Donohue / Luhr | Red Bull/Brumos Racing (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 59 | France / Bernhard / Haywood | Brumos Racing (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 61 | Wilkins / Wilden / Lacey | SAMAX/Doncaster Racing (CDN) | John Lacey | Porsche | 996 GT3 Cup | | Porsche | GT |
| 63 | Master / McCrackin | 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 | Krohn / Jönsson | Krohn Racing/TRG (USA) | Krohn/Buckler | Riley | Mk XI | | Pontiac | DP |
| 71 | Dalziel / Sellers / Greenberg | SAMAX (USA) | Peter Baron | Porsche | 996 GT3 Cup | | Porsche | GT |
| 73 | Liddell / Davis / Tafel | Tafel Racing (USA) | Tony Dowe | Porsche | 996 GT3 Cup | | Porsche | GT |
| 77 | Bobbi / Gollin | Doran Racing (USA) | Kevin Doran | Doran | JE4 | | Lexus | DP |
| 80 | Murry / Stanton | 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 |
| 88 | Nearn / Johnson | TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 94 | Patch / Brown / Soriano | Autometrics Motorsports (USA) | Cory Friedman | Porsche | 996 GT3 Cup | | Porsche | GT |