At the title screen on controller two, press Up, Triangle, Down, X, Right, Square, Left, Circle, Select, Start.
At the title screen on controller two, press Right(2), Down, Up(2), Left, Down, Left, Circle, Triangle.
At the title screen on controller two, press Up, Down(2), Up, Left, Right, Left, Right.
At the car selection screen, press L1 or R1 to display the vehicle's dimensions.