Black Box Classic Car:
To unlock the Black Box Classic car beat the Short Track Challenge.
Black Box Exotic Car:
To unlock the Black Box Exotic car beat the Half Season.
EA Sports Car:
To unlock the EA Sports car win the Road Course Challenge.
Beat the Superspeedway Shootout under either veteran or legend difficulty.
Play as Asher Boldt:
Go to the credits and select (development) when the credits role put this in as a code hold L2 and press Square, Circle, Triangle, and then X.
Treasure Island Track:
Beat a season under the veteran difficulty setting.
John Andretti's Second Car:
Select "Credits", then "Development" at the options menu. Wait for the FMV sequence to complete, then hold R1 and press Square, Triangle, Square, Triangle when the credits begin to roll.
Proving Grounds Track:
Select "Credits", then "Developers" at the options menu. Wait for the FMV sequence to complete, then hold R1 and press Left, Circle, Down, Right, Right, Right.
Quick Win d001c7740001 8001c7740032 d001a6400001 8001a6400032 d00209dc0001 800209dc0032 Start On Lap 2 d001c7740001 8001c7740002 d001a6400001 8001a6400002 d00209dc0001 800209dc0002
Thanks to Revolution readers Benny, Gamefreak and ~MaTT~!