Dale Earnhardt
Enter 'Dale' as a first name and 'Earnhardt' as a last name at the 'Create-A-Car' option.
Tiburon Speedway Track
Use a memory card with a game save file from any other EA Sports 2003 game.
Extra Drivers
Enter 'Extra' as a first name and 'Drivers' as a last name at the 'Create-A-Car' option.