| Race details | |||
|---|---|---|---|
| Race 17 of 36 in the 2003 NASCAR Winston Cup Series | |||
 Daytona International Speedway | |||
| Date | July 5, 2003 | ||
| Location | Daytona International Speedway, Daytona Beach, Florida | ||
| Course |
Permanent racing facility 2.5 mi (4.02336 km) | ||
| Distance | 160 laps, 400 mi (643.737 km) | ||
| Average speed | 166.109 mph (267.327 km/h) | ||
| Pole position | |||
| Driver | Richard Childress Racing | ||
| Most laps led | |||
| Driver | Kevin Harvick | Richard Childress Racing | |
| Laps | 54 | ||
| Winner | |||
| No. 16 | Greg Biffle | Roush Racing | |
| Television in the United States | |||
| Network | NBC | ||
| Announcers | Allen Bestwick, Benny Parsons, Wally Dallenbach Jr. | ||
| Nielsen Ratings | 6.0/13 | ||
The 2003 Pepsi 400, was a NASCAR Winston Cup Series race held on July 5, 2003, at Daytona International Speedway in Daytona Beach, Florida. Contested over 160 laps on the 2.5-mile (4.0 km) asphalt superspeedway, it was the seventeenth race of the 2003 NASCAR Winston Cup Series season. Greg Biffle of Roush Racing won the race, earning his first career Winston Cup Series win.