Pause the game and type in those codes:

 bouncy      Extra springy vehicles and track boundaries
 sticky      Increased traction for all cars
 slippery    Loss of traction
 turbo       Double your normal car speed
 war         Unlimited Bottle Rockets for everyone
 ghost       No collisions mode
 hitme       Aggressive computer drivers
 moon        Reduced gravity
 heavy       Increased gravity

 Money is harder (and more obvious) to get:

 Your name must be entered as I CHEAT and you must type in the code
 MONEY during the upgrade menu. This will give 200 Dollar