Unlock everything:
Enter VADKRAM as a profile name.


Enter the codes during gameplay. Each code only lasts for 30 seconds:

Up, Up, Left, Left, R1, R2, L1, L2	Trike Camera
L1, L2, R1, R2, Left, Left, Up, Up	Trippy Camera
, , , , , ,	Normal Car View
Up, , Down, , Left, , Right,	Funny Cars
Up, Right, Down, Left, L3, Left, Right, Left	Invisible Car
L1, L1, Left, Right, L3, L3, L3, L3,	Monster Truck
Up, Up, Down, Down, , , ,	Low Rider
, , , , , , ,	Big Heads

Thanks to Revolution readers CamaroCop21, Krysis00, popo, and Shoobaloo!