Big Trucks:
At the main menu, press L1, R2, L2, R1, Up. You will hear a burp to confirm it.

Super Car:
At the main menu, press L2, Left, Right, Up, Down, R2. You will hear a burp to confirm it. Start the race & zoom to the lead.

Take No Damage:
At the main menu press Left, Left, Left, Left, Up, Down, L1, R2.