Unlock all chase mode cars:
     Enter "Checkered Flag" as a case-sensitive first and last name at
Earn Your Stripes.

Unlock Walmart car and track:
     Enter "Walmart EveryDay" as a cheat code.

Unlock fantasy drivers:
     Enter "Race ThePack" as a cheat code.
     
EA Sports Car:
     Enter EA SPORTS CAR as a cheat code.