For the following cheats to work, you must complete and win a tournament race which will then allow you to access the following things:
Enter each code for the drivers name:
EAC POWR = This will allow you to drive the prototype vehicle called the Warrior.
EAC RALY = This changes Rusty Spings into rally mode. Also changes Vertico Ridge, Coastal and Alpine into Rally type tracks.
EAC WARP = This changes NFS into hyper arcade mode, which makes the game run very fast.