| 3.5.2003 | 250 mile Phoenix | 02 | Corvette Z06 | Altenburg | Powell Motorsport | 29th |
| 3.5.2003 | 250 mile Phoenix | 06 | Corvette | Alderman / Lisa | ICY Racing/SL Motorsports | DNA |
| 3.5.2003 | 250 mile Phoenix | 11 | Corvette Z06 | Goad | Powell Motorsport | 27th |
| 3.5.2003 | 250 mile Phoenix | 39 | Corvette Z06 | Huang | Silverstone Racing Services | 37th |
| 3.5.2003 | 250 mile Phoenix | 46 | Corvette | Morgan / Morgan | Acxiom | DNA |
| 4.5.2003 | Le Mans Test | 50 | Corvette C5-R | Fellows / O'Connell / Fréon / Gavin | Corvette Racing Gary Pratt | 25th |
| 4.5.2003 | Le Mans Test | 53 | Corvette C5-R | Gavin / Pilgrim / Collins / O'Connell | Corvette Racing Gary Pratt | 30th |
| 11.5.2003 | Belcar Spa Belpro | 5 | Corvette C5-R | Selleslagh / Vannerum | Selleslagh Racing Team | 2nd |
| 11.5.2003 | British GT Knockhill | 50 | Corvette C5 LMGT | Le Bas / Cole | Xero Competition | 6th |
| 18.5.2003 | 250 mile Barber | 02 | Corvette Z06 | Powell / Weinberg | Powell Motorsport | 22nd |
| 18.5.2003 | 250 mile Barber | 06 | Corvette | Alderman / Lisa / Rosenblum | ICY/SL Motorsports | 11th |
| 18.5.2003 | Spanish GT Jarama | 8 | Corvette C5 | Llobet / Fernandez Roca | Saturn Motorsport | 18th/14th |
| 18.5.2003 | 250 mile Barber | 11 | Corvette Z06 | Devon Powell | Powell Motorsport | DNS |
| 18.5.2003 | 250 mile Barber | 18 | Camaro | Leavy | Murray's Speed and Custom | 26th |
| 18.5.2003 | 250 mile Barber | 19 | Corvette | Hitt / Puleo / Mills | ACP Motorsports | DNA |
| 18.5.2003 | 250 mile Barber | 39 | Corvette Z06 | Huang / Hall | Silverstone Racing Services | 10th |
| 18.5.2003 | 250 mile Barber | 46 | Corvette | Morgan / Morgan | Morgan Dollar Motorsports | DNA |
| 18.5.2003 | 250 mile Barber | 76 | Corvette | Lisa / Rosenblum / Alderman | ICY Racing | DNA |
| 25.5.2003 | British GT Silverstone | 50 | Corvette C5 LMGT | Le Bas / Cole | Xero Competition | DNF |
| 1.6.2003 | 24 h Nürburgring | 17 | Corvette C5 | Zumtobel / Louisoder | | DNF |
| 8.6.2003 | 400 km Fontana | 02 | Corvette Z06 | | Powell Motorsport | DNA |
| 8.6.2003 | 400 km Fontana | 06 | Corvette | Alderman / Lisa / Rosenblum | ICY/SL Motorsports | DNA |
| 8.6.2003 | Belcar Spa SER | 5 | Corvette C5-R | Selleslagh / Vannerum | Selleslagh Racing Team | 5th |
| 8.6.2003 | 400 km Fontana | 11 | Corvette Z06 | Powell / Goad | Powell Motorsport | DNA |
| 8.6.2003 | Italian GT Monza | 11 | Corvette C5 | Poli / Meloni | Massimo Poli | 16th/DNS |
| 8.6.2003 | 400 km Fontana | 18 | Camaro | Leavy / Bupp | ChevyLeavy Racing Team | DNA |
| 8.6.2003 | 400 km Fontana | 19 | Corvette | Kerry Hitt | ACP Motorsports | DNA |
| 8.6.2003 | 400 km Fontana | 46 | Corvette | Morgan / Morgan | Morgan Dollar Motorsports | DNA |
| 15.6.2003 | 24 h Le Mans | 50 | Corvette C5-R | Gavin / Pilgrim / Collins | Corvette Racing-Gary Pratt | 11th |
| 15.6.2003 | 24 h Le Mans | 53 | Corvette C5-R | Fellows / O'Connell / Fréon | Corvette Racing-Gary Pratt | 12th |
| 15.6.2003 | 24 h Le Mans | | Corvette C5-RGT | | MCR | DNA |
| 15.6.2003 | 24 h Le Mans | | Corvette C5-RGT | Shane Lewis | MCR | DNA |
| 22.6.2003 | 6 h Watkins Glen | 05 | Corvette | Liniger / Metcalf / Carelli | Team Re/Max Racing | 14th |
| 22.6.2003 | 6 h Watkins Glen | 06 | Corvette | Alderman / Rosenblum | ICY/Racing | 21st |
| 22.6.2003 | 6 h Watkins Glen | 18 | Camaro | Bupp / Mills / Leavy | Murray's Speed and Custom | 19th |
| 22.6.2003 | 6 h Watkins Glen | 19 | Corvette | Hitt / Puleo / Mills | ACP Motorsports | DNA |
| 22.6.2003 | 6 h Watkins Glen | 46 | Corvette | Morgan / Morgan | Morgan Dollar Motorsports | DNA |
| 22.6.2003 | British GT Castle Combe | 50 | Corvette C5 LMGT | Le Bas / Cole | Xero Competition | DNS |
| 28.6.2003 | 400 km Mid-Ohio | 06 | Corvette | Alderman / Lisa / Rosenblum | ICY Racing | DNA |
| 28.6.2003 | 400 km Mid-Ohio | 18 | Camaro | Bupp | Murray's Speed and Custom | 29th |
| 28.6.2003 | 400 km Mid-Ohio | 19 | Corvette | Kerry Hitt | ACP Motorsports | DNA |
| 28.6.2003 | 400 km Mid-Ohio | 39 | Corvette Z06 | Huang / Hall | Silverstone Racing Services | 23rd |
| 28.6.2003 | 400 km Mid-Ohio | 46 | Corvette | Morgan / Morgan | Morgan Dollar Motorsports | DNA |
| 28.6.2003 | 400 km Mid-Ohio | 82 | Corvette | Fergus / Greer | Dick Greer Racing - Wendy's | 6th |
| 29.6.2003 | 2 h 45 min Road Atlanta | 3 | Corvette C5-R | Fellows / O'Connell | Corvette Racing | 9th |
| 29.6.2003 | 2 h 45 min Road Atlanta | 4 | Corvette C5-R | Collins / Gavin | Corvette Racing | 7th |
| 3.7.2003 | 250 mile Daytona | 06 | Corvette | Rosenblum / Alderman | ICY/SL Motorsports | 13th |
| 3.7.2003 | 250 mile Daytona | 18 | Camaro | Leavy / Bupp | ChevyLeavy.com Racing Team | 17th |
| 3.7.2003 | 250 mile Daytona | 19 | Corvette | Hitt / Puleo / Mills | ACP Motorsports | DNA |
| 3.7.2003 | 250 mile Daytona | 39 | Corvette Z06 | Huang / Hall | Silverstone Racing Services | 11th |
| 3.7.2003 | 250 mile Daytona | 46 | Corvette | Morgan / Morgan | Morgan Dollar Motorsports | DNA |
| 3.7.2003 | 250 mile Daytona | 50 | Camaro | | Dewey Motorsports | DNA |
| 6.7.2003 | Spanish GT Estoril | 8 | Corvette C5 | Llobet / Fernandez Roca | Club Sportiu+3 Sport | DNF/DNF |
| 13.7.2003 | British GT Oulton Park | 50 | Corvette C5 LMGT | Le Bas / Cole | Xero Competition | 9th |
| 27.7.2003 | 2 h 45 min Sonoma | 3 | Corvette C5-R | Fellows / O'Connell | Corvette Racing | 8th |
| 27.7.2003 | 2 h 45 min Sonoma | 4 | Corvette C5-R | Gavin / Collins | Corvette Racing | 9th |
| 27.7.2003 | 24 h Spa | 106 | Corvette C5-R | Bouvy / Selleslagh / Vannerum / Corbisier | Escelsior | 18th |
| 3.8.2003 | 3 h Trois-Rivières | 3 | Corvette C5-R | Fellows / O'Connell | Corvette Racing | 5th |
| 3.8.2003 | 3 h Trois-Rivières | 4 | Corvette C5-R | Gavin / Collins | Corvette Racing | 4th |
| 3.8.2003 | British GT Rockingham | 50 | Corvette C5 LMGT | Le Bas / Cole | Xero Competition | DNF |
| 8.8.2003 | 250 mile Watkins Glen | 05 | Corvette | Carelli / Metcalf | Team Re/Max Racing | 7th |
| 8.8.2003 | 250 mile Watkins Glen | 18 | Camaro | Leavy / Bupp | ChevyLeavy.com Racing Team | 11th |
| 8.8.2003 | 250 mile Watkins Glen | 19 | Corvette | Hitt / Puleo / Mills | ACP Motorsports | DNA |
| 17.8.2003 | 2 h 45 min Mosport | 3 | Corvette C5-R | Fellows / O'Connell | Corvette Racing | 4th |
| 17.8.2003 | 2 h 45 min Mosport | 4 | Corvette C5-R | Gavin | Corvette Racing | 31st |
| 17.8.2003 | British GT Thruxton | 50 | Corvette C5 LMGT | Le Bas / Cole | Xero Competition | 7th |
| 17.8.2003 | British GT Thruxton | 53 | Corvette | Bonner / Viets | Xero Competition | DNS |
| 24.8.2003 | 2 h 45 min Road America | 3 | Corvette C5-R | Fellows / O'Connell | Corvette Racing | 5th |
| 24.8.2003 | 2 h 45 min Road America | 4 | Corvette C5-R | Gavin / Collins | Corvette Racing | 9th |
| 24.8.2003 | 24 h Zolder | 5 | Corvette C5-R | Selleslagh / Vannerum / Hahn / Bouvy | Selleslagh Racing Team | DNF |
| 25.8.2003 | 1000 km Suzuka | 4 | Corvette C4 | Yoshida / Kobayashi / Ochiai | Zipspeed | NC |
| 31.8.2003 | 1000 km Spa | 150 | Corvette C5 LMGT | Cole / Le Bas / Cook | Ricky Cole | 14th |
| 31.8.2003 | 1000 km Spa | | Corvette C5 | Alan Bonner | Xero Competition | DNA |
| 7.9.2003 | 2 h 45 min Laguna Seca | 3 | Corvette C5-R | Fellows / O'Connell | Corvette Racing | 8th |
| 7.9.2003 | 2 h 45 min Laguna Seca | 4 | Corvette C5-R | Gavin / Collins | Corvette Racing | 9th |
| 14.9.2003 | Spanish GT Valencia | 8 | Corvette C5 | Llobet / Fernandez Roca | Club Sportiu+3 Sport | 18th/14th |
| 21.9.2003 | Belcar Spa RF | 5 | Corvette C5-R | Selleslagh / Vannerum | Selleslagh Racing Team | 3rd |
| 21.9.2003 | 6 h Mont-Tremblant | 38 | Corvette | Holtom / Martin / Hayner | Georgian Bay Motorsports | 12th |
| 27.9.2003 | 2 h 45 min Miami | 3 | Corvette C5-R | Fellows / O'Connell | Corvette Racing | 27th |
| 27.9.2003 | 2 h 45 min Miami | 4 | Corvette C5-R | Gavin / Collins | Corvette Racing | DNS |
| 28.9.2003 | British GT Brands Hatch | 15 | Camaro | Moss / Chester | AC Automotive Engineering | DNA |
| 28.9.2003 | British GT Brands Hatch | 50 | Corvette C5 LMGT | Le Bas / Cole | Xero Competition | 2nd |
| 28.9.2003 | British GT Brands Hatch | 53 | Corvette C5 | Bonner / Jones | Xero Competition | DNA |
| 5.10.2003 | 400 km Virginia | 06 | Corvette | Alderman / Rosenblum / Lisa | ICY/SL Motorsports | 10th |
| 5.10.2003 | 400 km Virginia | 18 | Camaro | Leavy / Bupp | ChevyLeavy Racing Team | DNA |
| 5.10.2003 | 400 km Virginia | 19 | Camaro | Trinkler | ACP Motorsports | 25th |
| 5.10.2003 | 400 km Virginia | 39 | Corvette Z06 | Huang / Hall | Silverstone Racing Services | DNA |
| 5.10.2003 | 400 km Virginia | 40 | Corvette C5 | Gregg / Wilden | Derhaag Motorsports | 18th |
| 12.10.2003 | Spanish GT Jerez | 8 | Corvette C5 | Llobet / Fernandez Roca | Club Sportiu+3 Sport | DNF/11th |
| 18.10.2003 | Petit Le Mans | 3 | Corvette C5-R | Fellows / O'Connell / Fréon | Corvette Racing | 14th |
| 18.10.2003 | Petit Le Mans | 4 | Corvette C5-R | Gavin / Collins / Pilgrim | Corvette Racing | 7th |
| 19.10.2003 | Belcar Zolder BM | 5 | Corvette C5-R | Vannerum / Selleslagh | Selleslagh Racing Team | 12th |
| 2.11.2003 | 3 h Daytona | 05 | Corvette | Metcalf / Carelli | Team Re/Max Racing | 9th |
| 2.11.2003 | 3 h Daytona | 06 | Corvette | Alderman / Lisa / Rosenblum | ICY/SL Motorsports | 25th |
| 2.11.2003 | 3 h Daytona | 18 | Camaro | Bupp / Leavy | ChevyLeavy.com Racing Team | 30th |
| 2.11.2003 | 3 h Daytona | 40 | Corvette C5 | Gregg / Bell | Derhaag Motorsports | 5th |
| 2.11.2003 | 3 h Daytona | 50 | Corvette | Amick / Amick | Team Amick Motorsports | 21st |
| 2.11.2003 | 3 h Daytona | 52 | Corvette | Gilbert / Faraci | Gilbert Racing | DNS |
| 9.11.2003 | Spanish GT Barcelona | 8 | Corvette C5 | Llobet / Fernandez Roca | Club Sportiu+3 Sport | 35th |
| 9.11.2003 | 1000 km Le Mans | 31 | Corvette C5 LMGT | Cole / Le Bas / Cook | RJ Cole | DNS |