| 01 | Pruett / Rojas / Duran | TELMEX Chip Ganassi with Felix Sabates (USA) | Mike Hull | Riley | Mk XI | Lexus | DP |
| 03 | Holtom / Curran / Wilden | Georgian Bay Motorsports | | Chevrolet | Corvette | Chevrolet | GT |
| 05 | Auberlen / Alhadeff / Hand | Luggage Express Team Sigalsport BMW | Emmanuel Lupe | Riley | Mk XI | BMW | DP |
| 06 | Reese / Lewis, Jr. / O'Connell | Banner Racing (USA) | Leighton Reese | Pontiac | GXP.R | Pontiac | GT |
| 07 | Edwards / Collins / Pilgrim | Banner Racing | Leighton Reese | Pontiac | GXP.R | Pontiac | GT |
| 09 | Camirand / Goad / Cosmo | Spirit of Daytona Racing | Troy Flis | Fabcar | FDSC/03 | Porsche | DP |
| 3 | Lewis / Lux | Southard Motorsports | Steve Southard | Riley | Mk XI | Lexus | DP |
| 6 | Pew / James / Zogaib | Michael Shank Racing | Michael Shank | Riley | Mk XI | Lexus | DP |
| 10 | Taylor / Angelelli / Magnussen | SunTrust Racing | Debbie Savini | Riley | Mk XI | Pontiac | DP |
| 11 | Szekeres / Dalziel / Enge | SAMAX | Peter Baron | Riley | Mk XI | Pontiac | DP |
| 12 | Schramm / Bell / Lester | RVO Motorsports | Dave Watson | Riley | Mk XI | Pontiac | DP |
| 17 | Wilkins / Lacey / Papadopoulos | Doncaster Racing | John Lacey | Porsche | 997 GT3 Cup | Porsche | GT |
| 19 | Cameron / Valiante | Chip Ganassi with Felix Sabates | Steve Cameron? | Riley | Mk XI | Lexus | DP |
| 21 | Tallman / Kozarov / Rossberg | Matt Connolly Motorsports | Matt Connolly | Pontiac | GTO.R | Pontiac | GT |
| 22 | de Quesada / Dumoulin / Gabel / Stanton | Alegra Motorsports/Fiorano Racing | Carlos de Quesada | Porsche | 997 GT3 Cup | Porsche | GT |
| 23 | Bergmeister / Rockenfeller / Long | Alex Job Racing | Alex Job | Crawford | DP03 | Porsche | DP |
| 26 | de Quesada / Dumoulin / Wilson | Alegra Motorsports/Fiorano Racing | Carlos de Quesada | Porsche | 997 GT3 Cup | Porsche | GT |
| 27 | O'Connell / Speakman / Roush | O'Connell Racing | Kevin O'Connell | Porsche | 997 GT3 Cup | Porsche | GT |
| 30 | Staveley / Nearn / Dobson / Riley | Racers Edge Motorsports | Jon Mirachi | Pontiac | GXP.R | Pontiac | GT |
| 31 | Connolly / Ingham / Ballou / Rossberg | Matt Connolly Motorsports | Matt Connolly | Chase | CCE-001 | Pontiac | DP |
| 33 | Constantine / Borkowski / Murry | Playboy Racing/Unitech | Jackson Stewart | Nissan | 350Z | Nissan | GT |
| 35 | Constantine / Borkowski / Murry | Playboy Racing/Unitech | Jackson Stewart | Nissan | 350Z | Nissan | GT |
| 36 | DiMeo / Doane / St. Amour | Competition Marketing Motorsports | Nick DiMeo | Pontiac | GTO | Pontiac | GT |
| 39 | Fittipaldi / Brix / Antinucci | Cheever Racing - Pontiac (USA) | Eddie Cheever, Jr. | Fabcar | FDSC/03 | Pontiac | DP |
| 40 | Foster / Espenlaub / Dempsey | Hyper Sport | Joe Foster | Mazda | RX-8 | Mazda | GT |
| 42 | Sahlen / Nonnamaker | Team Sahlen | Mike Thomas | Chevrolet | Corvette | Chevrolet | GT |
| 43 | Nonnamaker / Nonnamaker / Nonnamaker | Team Sahlen | Mike Thomas | Chevrolet | Corvette | Chevrolet | GT |
| 56 | Beachman / Fitzgerald / McClure | Beachman Racing | | Chevrolet | Corvette | Chevrolet | GT |
| 57 | Bunting / Cicero / Gue | Stevenson Motorsports (USA) | John Stevenson | Chevrolet | Corvette | Chevrolet | GT |
| 58 | Donohue / Law / Rice | Red Bull/Brumos Porsche | Michael Colucci | Riley | Mk XI | Porsche | DP |
| 59 | France / Haywood / Borcheller | Brumos Porsche/Kendall (USA) | Michael Colucci | Riley | Mk XI | Porsche | DP |
| 60 | Patterson / Negri / Wilson | Michael Shank Racing | Michael Shank | Riley | Mk XI | Lexus | DP |
| 61 | Frisselle / Wilkins / Frisselle | AIM Autosport | Ian Willis | Riley | Mk XI | Lexus | DP |
| 62 | Pruitt / Aguas / Jeannette / Burke | Corsa Motorsports | | Ferrari | F430 | Ferrari | GT |
| 64 | Lowe / Pace / Potter | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | Porsche | GT |
| 65 | Smith / DiLeo / Sellers | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | Porsche | GT |
| 66 | Lally / Pumpelly / Valentine | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | Porsche | GT |
| 67 | Mayes / Wahl / Ludwig | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | Porsche | GT |
| 69 | Haskell / Longhi / Armengol / *Assentato / *Segal | SpeedSource | Sylvain Tremblay | Mazda | RX-8 | Mazda | GT |
| 70 | Haskell / Tremblay / Ham | SpeedSource | Sylvain Tremblay | Mazda | RX-8 | Mazda | GT |
| 75 | Jönsson / Braun | Krohn Racing | Jeff Hazell | Riley | Mk XI | Pontiac | DP |
| 76 | Krohn / Papis | Krohn Racing | Jeff Hazell | Riley | Mk XI | Pontiac | DP |
| 77 | Gidley / Jaeger | Feeds The Need/Doran Racing | Kevin Doran | Doran | JE4 | Ford | DP |
| 81 | Johnson / Davis / Wagner | Synergy Racing | Cole Scrogham | Porsche | 997 GT3 Cup | Porsche | GT |
| 85 | Farnbacher / Keen / Baas | Farnbacher Loles Motorsports | Alan Lourenco | Porsche | 997 GT3 Cup | Porsche | GT |
| 87 | Miller / Werner / Henzler | Farnbacher Loles Motorsports | Gregory Loles | Porsche | 997 GT3 Cup | Porsche | GT |
| 91 | Matthews / Goossens / Hunter-Reay | Riley-Matthews Motorsports | Bill Riley | Riley | Mk XI | Pontiac | DP |
| 99 | Gurney / Fogarty / Vasser | Gainsco/Bob Stallings Racing | Bob Stallings | Riley | Mk XI | Pontiac | DP |