| 00 | Porsche 996 GT3 Cup | Team Vision | white(+blue/yellow) | Bernheim/Callas/VISION | Hoosier | Motul | closed | rear |
| 01 | Riley Mk XI Lexus | CGR Grand Am | white/red | COMP USA/TELMEX | Goodyear | | closed | mid |
| 09 | Crawford DP03 Pontiac | Spirit of Daytona Racing | red | CITGO | Goodyear | | closed | mid |
| 2 | Crawford DP03 Chevrolet | Howard - Boss Motorsports | red/blue | CITGO | Goodyear | Sunoco | closed | mid |
| 4 | Crawford DP03 Chevrolet | Howard - Boss Motorsports | white/red/black | BOSS | Goodyear | Red Line Oil | closed | mid |
| 5 | Multimatic MDP1 Ford Focus | Essex Racing | silver (+black) | Shred-it/SPEED SECRETS | Goodyear | | closed | mid |
| 6 | Doran JE4 Lexus | Michael Shank Racing | white/blue (+red) | Px.com/TransVuDEDICATED MICROS | Goodyear | | closed | mid |
| 7 | Fabcar FDSC/03 BMW | Southard Motorsports | white (+blue/red) | BMW FABCAR | Goodyear | | closed | mid |
| 9 | Multimatic MDP1 Ford Focus | Mears Motorcoach/SpeedSource | yellow (+black) | MEARS MOTOR COACH | Goodyear | | closed | mid |
| 10 | Riley Mk XI Pontiac | SunTrust Racing | black (+yellow) | SUNTRUST | Goodyear | | closed | mid |
| 11 | Ferrari 360 Modena N-GT | JMB Racing USA | red (+white) | The Inn/ANTIGUA SLIPWAY | Dunlop | | closed | mid |
| 13 | Porsche 996 GT3 Cup | Foxhill Racing | green/silver (+white) | FOXHILL RACING | Hoosier | | closed | rear |
| 14 | Porsche 996 GT3 Cup | Autometrics Motorsports | white/blue | Autometrics MOTORSPORTS/BL Patch | Hoosier | | closed | rear |
| 15 | Multimatic MDP1 Ford Focus | Essex Racing | white | Whos Calling | Goodyear | | closed | mid |
| 16 | Porsche 996 GT3 Cup | AASCO Motorsports | white/red/black | HOOTERS | Hoosier | | closed | rear |
| 17 | Porsche 996 GT3 Cup | AASCO Motorsports | white/red/black | HOOTERS | Hoosier | | closed | rear |
| 21 | BMW M3 E46 | Prototype Technology Group | white/black/red | BMW Financial Services/Original BMW Parts/PERFORMANCE FRICTION BRAKES | Dunlop | Castrol | closed | front |
| 22 | BMW M3 E46 | Prototype Technology Group | white/black/red | BMW Financial Services/Original BMW Parts/PERFORMANCE FRICTION BRAKES | Dunlop | Castrol | closed | front |
| 24 | Chevrolet Corvette C5 | Specter Werks/Sports | black (+light blue) | CAULEY/HIGHLANDER | Dunlop | Mobil 1 | closed | front |
| 27 | Doran JE4 Lexus | Doran Lista Racing | red (+blue) | LISTA | Goodyear | | closed | mid |
| 30 | Maserati Light GT | Risi Competizione | white (+blue) | MASERATI OF HOUSTON | Dunlop | | closed | front |
| 33 | Maserati Trofeo Light | Scuderia Ferrari of Washington | blue (+white/red) | MASERATI Of Washington | Dunlop | | closed | front |
| 37 | Porsche 996 GT3 Cup | TPC Racing | white (+green/red) | Ajilon/TURBO Performance | Hoosier | | closed | rear |
| 38 | Porsche 996 GT3 Cup | TPC Racing | white (+green/red) | Ajilon/TURBO Performance | Hoosier | | closed | rear |
| 41 | Porsche 996 GT3 Cup | Orison-Planet Earth Motorsports | blue/green | ORISON/DENSO/Jack Link's | Hoosier | | closed | rear |
| 42 | Porsche 996 GT3 Cup | TheRaceSite.com Racing | yellow (+red) | TheRaceSite/SPEEDSOURCE | Hoosier | | closed | rear |
| 44 | Porsche 996 GT3-RS | Orbit Racing | silver | CLASSIC INDUSTRIES, INC. | Dunlop | | closed | rear |
| 45 | Fabcar FDSC/03 Porsche | Gunnar Racing | black/yellow (+red) | Cars/Disney PRESENTS PIXAR FILM | Goodyear | | closed | mid |
| 46 | Chevrolet Corvette Z06 | Michael Baughman Racing | white (+blue/red) | YEAKLE'S | Hoosier | | closed | front |
| 47 | Porsche 996 GT3 Cup | Michael Baughman Racing | white (+blue) | WS | Hoosier | | closed | rear |
| 54 | Doran JE4 Pontiac | Bell Motorsports | silver/yellow | Kodak/EasyShare | Goodyear | | closed | mid |
| 56 | Porsche 996 GT3-RS | Seikel Motor Sport | white/black | TDM | Dunlop | Castrol | closed | rear |
| 57 | Porsche 996 GT3-R | Stevenson Motorsports/Auto Assets | white (+blue/red) | STEVENSON GROUP | Dunlop | | closed | rear |
| 58 | Fabcar FDSC/03 Porsche | Red Bull - Brumos Porsche | dark blue (+yellow/red) | Red Bull/Brumos Porsche | Goodyear | | closed | mid |
| 59 | Fabcar FDSC/03 Porsche | Brumos Racing | white (+red/blue) | Brumos Porsche | Goodyear | | closed | mid |
| 60 | Chevrolet Corvette | Xtreme Racing Group | white (+black) | Dubler | Dunlop | | closed | front |
| 63 | Porsche 996 GT3 Cup | Glenn Yee Motorsports | white | Power | Hoosier | Motul | closed | rear |
| 66 | Porsche 996 GT3-RS | The Racers Group/Monster Cable | blue (+yellow) | RACER'S GROUP/MONSTER CABLE/ADOBE ROAD/CARLSEN | Dunlop | | closed | rear |
| 67 | Porsche 996 GT3-RS | The Racers Group/Monster Cable | blue (+yellow) | RACER'S GROUP/MONSTER CABLE/www.flamingoresort.com/ATLANTIS | Dunlop | | closed | rear |
| 68 | Porsche 996 GT3-RS | The Racers Group/Monster Cable | blue (+yellow) | RACER'S GROUP/MONSTER CABLE/Gleason/F1 Boston | Dunlop | | closed | rear |
| 70 | Multimatic MDP1 Ford Focus | SpeedSource | blue/white (+red) | workscape | Goodyear | Motul | closed | mid |
| 71 | Porsche 996 GT3 Cup | Doncaster Racing | white (+red) | Minestar Solutions/KOLTER/Ramset/DENON/PFAFF | Hoosier | | closed | rear |
| 72 | Porsche 996 GT3 Cup | Jack Lewis Enterprises | silver/red (+orange) | MYRTLETECH | Dunlop | | closed | rear |
| 73 | Ferrari 360 Modena N-GT | Red Bull BE Racing | blue (+yellow/red) | RedBull | Dunlop | | closed | mid |
| 74 | Porsche 996 GT3 Cup | Flying Lizard Motorsports | silver/red | FLYING LIZARD | Dunlop | | closed | rear |
| 75 | Porsche 996 GT3-RS | Flying Lizard Motorsports | silver/red | FLYING LIZARD | Dunlop | | closed | rear |
| 80 | Picchio DP2 BMW | G&W Motorsports | white (+red) | USI/Autoleader/VISIT CATANIA SICILY | Goodyear | | closed | mid |
| 82 | Porsche 996 GT3 Cup | dds Racing | white (+violet/black) | EURO MOTORWORKS | Hoosier | | closed | rear |
| 83 | Porsche 996 GT3-RS | Cirtek Motorsport | dark blue/silver | CIRTEK | Dunlop | | closed | rear |
| 86 | Porsche 996 GT3 Cup | G&W Motorsports | blue (+yellow/red) | QUAKER STATE/AutoBySite.com | Hoosier | | closed | rear |
| 88 | Porsche 996 GT3-RS | ASM Team | orange (+blue) | Fastaccess/BARBOT/MAXMEN | Dunlop | | closed | rear |
| 91 | Porsche 996 GT3 Cup | Doncaster Racing | white (+black) | KOLTER | Hoosier | | closed | rear |
| 93 | Ferrari 360 Modena Challenge | Mastercar | red | GLEO/Eurotarget | Dunlop | | closed | mid |
| 94 | Ferrari 360 Modena N-GT | Mastercar | red | GLEO/Eurotarget/TONDACH | Dunlop | | closed | mid |
| 97 | Porsche 996 GT3-R | Graham Nash Motorsport | white (+red/blue) | | Dunlop | | closed | rear |
| 98 | Porsche 996 GT3 Cup | GT Technologies | dark blue/silver | | Dunlop | | closed | rear |