Better Traction
At the main menu press Left, L1, R2, R1, Left, R2, R2, R2. You should hear a burp if entered correctly
Ice Cream Truck
Hold L1 + L2 on the vehicle selection screen and hold while selecting driver
No Damage
At the main menu pressLeft, Left, Left, Up, Down, L1, R2. You should hear a burp if entered correctly
Super Car
At the main menu press L2, Left, Right, Up, Down, R2. You should hear a burp if entered correctly