Fantasy Drivers:
Go to the Create-A-Car option and enter the following name:
Extra Drivers

Unlock Tiburon Track:
To unlock the Tiburon Track you must have a game
save of another 2003 title (such as NCAA Football 2003).

Unlock Dale Earnhardt:
Go to the Create-A-Car option and enter the name: 
Dale Earnhardt. Exit Create-A-Car and you will receive a 
Dale Earnhardt Thunder Plate.

Unlock Paint Schemes:
To unlock a paint scheme for a specific driver, win a race
under Veteran or Legend mode.