| 01 | Pruett / Diaz | CompUSA Chip Ganassi with Felix Sabates (USA) | Mike Hull | Riley | Mk XI | | Lexus | DP |
| 04 | Sigal / MacLeod | Sigalsport BMW | Gene Sigal | BMW | M3 | E46 | BMW | GT |
| 05 | Auberlen / Alhadeff / Hand | Sigalsport BMW | Gene Sigal | BMW | M3 | E46 | BMW | GT |
| 06 | Gaffney / Reese / Tolsma | Banner Racing (USA) | Leighton Reese | Chevrolet | Corvette | | Chevrolet | GT |
| 09 | Goad / Grégoire | Spirit of Daytona Racing (USA) | Troy Flis | Crawford | DP03 | | Pontiac | DP |
| 3 | Lewis / Stanton | Southard Motorsports | Steve Southard | Riley | Mk XI | | BMW | DP |
| 4 | Wallace / Leitzinger | Howard - Boss Motorsports | Maxwell Crawford | Crawford | DP03 | | Pontiac | DP |
| 5 | Valiante / Finlay / Cosmo | Essex/Finlay Motorsports | Michael Gue | Crawford | DP03 | | Ford | DP |
| 6 | Borkowski / Constantine / Mears, Jr. | Playboy Racing/Mears-Lexus/Riley | Michael Shank | Riley | Mk XI | | Lexus | DP |
| 7 | Tuttle / MacLeod | Tuttle Team Racing (USA) | Peter Baron | Riley | Mk XI | | Pontiac | DP |
| 8 | Frisselle / Frisselle / Unser, Jr. | Synergy Racing (USA) | Cole Scrogham | Doran | JE4 | | Porsche | DP |
| 10 | Angelelli / Taylor / Briscoe | SunTrust Racing (USA) | Bill Riley | Riley | Mk XI | | Pontiac | DP |
| 11 | Goossens / Duno / Johansson | CITGO Racing by SAMAX | | Riley | Mk XI | | Pontiac | DP |
| 12 | Fernandez / Haberfeld | Lowe's Fernandez Racing | Tom Anderson | Riley | Mk XI | | Pontiac | DP |
| 16 | Dyson / Dyson / Smith | Howard - Boss Motorsports (USA) | Maxwell Crawford | Crawford | DP03 | | Pontiac | DP |
| 17 | Wilkins / Lacey / Wilkins | SAMAX (USA) | Peter Baron | Porsche | 997 GT3 Cup | | Porsche | GT |
| 19 | McDowell / Gidley / Cosmo | Playboy/Uniden Racing | Steve Cameron | Crawford | DP03 | | Ford | DP |
| 21 | Schultz / Connolly | Matt Connolly Motorsports | Matt Connolly | BMW | M3 | E46 | BMW | GT |
| 22 | Dumoulin / Longhi / Assentato | Fiorano Racing | Giovanni Panico | Porsche | 996 GT3 Cup | | Porsche | GT |
| 23 | Rockenfeller / Long | Alex Job Racing/Emory Motorsports | Alex Job | Crawford | DP03 | | Porsche | DP |
| 27 | O'Connell / Speakman / Bowles | Taleo Grill Racing | Kevin O'Connell | Porsche | 996 GT3 Cup | | Porsche | GT |
| 35 | Pumpelly / Angelone | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 36 | Pobst / Baas | TPC Racing (USA) | Michael Levitas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 39 | Fittipaldi / Cheever, Jr. / Orsi | Crown Royal Special Reserve/Cheever | Eddie Cheever, Jr. | Crawford | DP03 | | Porsche | DP |
| 40 | Ruhlman / Guenette | Derhaag Motorsports (USA) | Chris Bingham | Riley | Mk XI | | Pontiac | DP |
| 41 | Michaelian / Sahlen / Frost | Team Sahlen (USA) | Mike Thomas | Porsche | 996 GT3 Cup | | Porsche | GT |
| 46 | DeFontes / Baughman / Yeakle | Michael Baughman Racing (USA) | Michael Baughman | Chevrolet | Corvette | | Chevrolet | GT |
| 57 | Rice / Riggins / Cicero | Stevenson Motorsports (USA) | John Stevenson | Chevrolet | Corvette | | Chevrolet | GT |
| 58 | Law / Donohue | Red Bull/Brumos Porsche (USA) | James Bailie | Fabcar | FDSC/03 | | Porsche | DP |
| 59 | France / Haywood / Christopher | Brumos Racing (USA) | James Bailie | Fabcar | FDSC/03 | | Porsche | DP |
| 60 | Negri / Patterson | Michael Shank Racing | Michael Shank | Riley | Mk XI | | Lexus | DP |
| 64 | Edwards / Collins / Pilgrim | TRG (USA) | Kevin Buckler | Pontiac | GTO.R | | Pontiac | GT |
| 65 | Bunting / Lally / Valentine | TRG (USA) | Kevin Buckler | Pontiac | GTO.R | | Pontiac | GT |
| 66 | Pace / Lowe | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 67 | Solley / Kroczek / Marden | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 72 | Liddell / Henzler | Tafel Racing | Tony Dowe | Porsche | 997 GT3 Cup | | Porsche | GT |
| 73 | Davis / Tafel | Tafel Racing (USA) | Tony Dowe | Porsche | 997 GT3 Cup | | Porsche | GT |
| 74 | Lux / Espenlaub | Tafel Racing (USA) | Tony Dowe | Porsche | 997 GT3 Cup | | Porsche | GT |
| 75 | Krohn / Jönsson | Krohn Racing | Jeff Hazell | Riley | Mk XI | | Ford | DP |
| 76 | Bergmeister / Said | Krohn Racing | Jeff Hazell | Riley | Mk XI | | Ford | DP |
| 77 | Brix / Borcheller | Feeds The Need/Doran Racing (USA) | Kevin Doran | Doran | JE4 | | Ford | DP |
| 78 | Zacharias / Kuttner | Doran/Pegasus Racing (USA) | Kevin Doran | Doran | JE4 | | Pontiac | DP |
| 80 | Murry / Keen | Shoes for Crews/Synergy Racing (USA) | Cole Scrogham | Porsche | 997 GT3 Cup | | Porsche | GT |
| 81 | Johnson / Nearn / Thornton | Synergy Racing (USA) | Cole Scrogham | Porsche | 997 GT3 Cup | | Porsche | GT |
| 89 | Dalziel / Figge | Pacific Coast Motorsports | Tyler Tadevic | Riley | Mk XI | | Pontiac | DP |
| 99 | Gurney / Fogarty / Stallings | Gainsco/Blackhawk Racing (USA) | Bob Stallings | Riley | Mk XI | | Pontiac | DP |