Enter Buld mode and create a new diver or edit an existing one. 
Now make a licence and enter these cheats as your driver's name: 

FLYSKYHGH - Your car floats and has an infenidit amount of rocket fuel. 

FSTFRWD - Your car is now in turbo mode. 

NCHSSS - Removes your car's chassis and bricks. 

NDRVR - Removes your car's driver. 

NSLWJ - Your car doesent slow down on grass, sand, rocks, ect. 

NWHLS - You have no wheels on your car. 

Submitted by pyro_brian