The 2004 Pepsi 400 was a NASCAR Nextel Cup Series race held on July 3, 2004 at Daytona International Speedway in Daytona Beach, Florida. The race, the twentieth of the season, was contested over 160 laps. Jeff Gordon, driver of the #24 Hendrick Motorsports Chevrolet, won the race from the pole position, and also led the most laps. Former Jacksonville Jaguars quarterback Byron Leftwich was the grand marshal for the race; NBA All-Star Tracy McGrady was originally the grand marshal, but was replaced by Leftwich due to scheduling conflicts.