Unlimited Turbos:
Go to the main title screen and press R1+L1, R2+L2, R1+L1, R2+L2.
If the code is correct, a message of confirmation will flash up on-screen.
Infinite Ammo:
Pause the game at any point and press L2, R2, L1, R1, R2+L2, R1+L1.
Unpause to get infinite ammo.
Infinite Shields:
Pause the game at anytime and press R1+L1, R2+L2, L1_L2, R1+R2.
Now unpause to be instantly shielded.
All Tracks:
Go to the main menu and press L1, L1, L2, L2, R2, R2, R1, R1 then
R1+L1+L2+R2.
