Enter the following codes to unlock bonus cars in Free Race mode.

Effect	Code
Advan	On controller 2 hold R1 + Triangle + Up + Start until the title screen appears.
Castrol	On controller 2 hold R1 + Square + Down + Start until the title screen appears.
Class 1 Car	On controller 2 hold R1 + Circle + Up + Start until the title screen appears.
Dunlop	On controller 2 hold R1 + Down + Triangle + Start until the title screen appears.
Honda	On controller 2 hold R1 + Up + Square + Start until the title screen appears.