To unlock all cars and tracks, enter the following button combination while you are selecting your cars and tracks: R2, R2, L1, R2, LEFT, DOWN, RIGHT, UP, UP, RIGHT, DOWN, LEFT.
Quick Teleport
During a race, enter the following button combination to teleport from last place to first place: CIRCLE, X, UP, UP, X, CIRCLE.
Unlock Super Mustang
Play the Stock Car level. When driving past a certain speed, you will hear a sound that will confirm that the Super Mustang has been unlocked.