Invincibility
Pause the game and press Triangle, Triangle, Circle, Circle, L1, L2.

Infinite nitro
Pause the game and press L1, L1, R1, R1, Circle, Circle.

Infinite time
Pause the game and press L1, R1, Square, Square, R1, L1.

Rainy weather
Pause the game and press Square, Square, L1, L1, Triangle, Circle.

No body
Pause the game and press L1, R1, R1, L1, L1, R1.

Snake car
Pause the game and press Circle, Square, R1, R1, Circle, L1, Circle.