Cheat codes

Go to the main menu, then select "Options". From there, select "Cheat Codes". Press the 2 button to pound in the codes. You will have to turn these on every time you play the game:
Boost at the start of race - IMSPEED
Unlock all cars - YAYCARS
Unlock all paint jobs - R4MONE
Unlimited Turbo - VROOOOM
All videos - WATCHIT
All concept art - CONC3PT
All tracks and mini-games - MATTL66
All Tracks, Mini-game, cars, and paint jobs - IF900HP
Mater's Speedy Circuit and Mater's Countdown Cleanup - TRGTEXC

If you entered these codes correctly, you will leave the "Cheat Codes" menu.