| 01 | Diaz / Pruett | CompUSA Chip Ganassi with Felix Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 02 | Wagner / Johansson | New Century Mtg/Chip Ganassi with Sabates (USA) | Chip Ganassi | Riley | Mk XI | | Lexus | DP |
| 05 | Sigal / Alhadeff | Sigalsport (USA) | Gene Sigal | Porsche | 996 GT3 Cup | | Porsche | GT |
| 06 | Brix / Dyson | Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 07 | Ward / *Moreno | 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 / Lammers | CITGO - Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 3 | Grala / Lewis | 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 | Cicero / Gue | Essex Racing (USA) | Mike Gue | Crawford | DP03 | | Ford | DP |
| 6 | Mears, Jr. / Borkowski | Michael Shank Racing (USA) | Michael Shank | Riley | Mk XI | | Pontiac | DP |
| 7 | Ave / Petty / Tuttle | Tuttle Team Racing/SAMAX (USA) | Brian Tuttle/Peter Baron | Riley | Mk XI | | Pontiac | DP |
| 8 | Frisselle / Frisselle | Rx.com/Synergy Racing (USA) | Cole Scrogham | Doran | JE4 | | BMW | DP |
| 10 | Taylor / Angelelli | SunTrust Racing (USA) | Wayne Taylor | Riley | Mk XI | | Pontiac | DP |
| 14 | Friedman / Keen | Autometrics Motorsports (USA) | Cory Friedman | Porsche | 996 GT3 Cup | | Porsche | GT |
| 15 | Guenette / Bingham | CB Motorsports (USA) | Chris Bingham | Riley | Mk XI | | Lexus | DP |
| 16 | Marks / Hand | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 17 | Valentine / Collins | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 19 | Gidley / McDowell | Finlay Motorsports (USA) | Rob Finlay | Riley | Mk XI | | BMW | DP |
| 20 | Stewart / Wallace | CITGO - Howard - Boss Motorsports (USA) | Rick Howard | Crawford | DP03 | | Pontiac | DP |
| 21 | Auberlen / Milner | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 22 | Gleason / James | Prototype Technology Group (USA) | Tom Milner | BMW | M3 | E46 | BMW | GT |
| 23 | Szekeres / *Espenlaub | Horizon Motorsports LLC (USA) | Jim Harrell | Pontiac | GTO | | Pontiac | GT |
| 24 | Emory / Ridgway | Emory Motorsports/BGB (USA) | Rod Emory | Porsche | 996 GT3 Cup | | Porsche | GT |
| 26 | Flanagan / Long | AASCO Motorsports (USA) | Dennis Aase | Porsche | 996 GT3 Cup | | Porsche | GT |
| 30 | Gabel / de Quesada | Alegra Motorsports (USA) | Carlos DeQuesada | Porsche | 996 GT3 Cup | | Porsche | GT |
| 32 | Weinberg / *Stubber | Horizon Motorsports LLC (USA) | Jim Harrell | Pontiac | GTO | | Pontiac | GT |
| 35 | Assentato / Longhi | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 36 | Levitas / Pobst | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 37 | Littlechild / Pumpelly | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 38 | Matos / Fitzgerald | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 39 | Matthews / Smith | 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 / Roehrig | 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 |
| 44 | Labonte / Labonte | Doran Racing (USA) | Kevin Doran | Doran | JE4 | | Pontiac | DP |
| 48 | Hauser / Dubler | Xtreme Racing Group (USA) | Anthony Puleo | Chevrolet | Corvette | | Chevrolet | GT |
| 54 | Borcheller / *Kelleners | Kodak - Bell Motorsports (USA) | James Bell | Doran | JE4 | | Pontiac | DP |
| 57 | Rice / Riggins | Stevenson Motorsports (USA) | Stevenson/Southard | Chevrolet | Corvette | | Chevrolet | GT |
| 58 | Law / Donohue | Red Bull/Brumos Racing (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 59 | France / Haywood | Brumos Racing (USA) | Bob Snodgrass | Fabcar | FDSC/03 | | Porsche | DP |
| 61 | Dalziel / Dalziel | SAMAX (USA) | Peter Baron | Porsche | 996 GT3 Cup | | Porsche | GT |
| 63 | Master / Pattee | Auto Gallery/TRG (USA) | Kevin Buckler | Porsche | 996 GT3 Cup | | Porsche | GT |
| 64 | Magnussen / Edwards | TRG (USA) | Kevin Buckler | Pontiac | GTO.R | | Pontiac | GT |
| 65 | Bunting / Lally | TRG (USA) | Kevin Buckler | Pontiac | GTO.R | | Pontiac | GT |
| 66 | Bergmeister / Papis | 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 |
| 73 | Davis / Tafel | 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 | Synergy Racing (USA) | Cole Scrogham | Porsche | 996 GT3 Cup | | Porsche | GT |
| 81 | Van Wijk / Murry | Synergy Racing (USA) | Cole Scrogham | Porsche | 996 GT3 Cup | | Porsche | GT |
| 87 | Marshall / Marshall | 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 | Brown, III / McGehee / Patch | Autometrics Motorsports (USA) | Cory Friedman | Porsche | 996 GT3 Cup | | Porsche | GT |
| 99 | Stallings / Gurney | Gainsco/Blackhawk Racing (USA) | Bob Stallings | Riley | Mk XI | | Pontiac | DP |