Cars Codes -

All races:
Submit the code MATTL66 

All cars:
Submit the code YAYCARS 

All tracks and mini-games:
Submit the code IF900HP 

Maters Speedy Circuit and Maters Countdown cleanup:
Submit the code TRGTEXC 

Super fast start:
Submit the code IMSPEED 

Unlimited boost:
Submit the code VROOOOM 

Drive on fire:
Submit the code TORCHED 

All paint jobs:
Submit the code R4MONE 

All movies:
Submit the code WATCHIT 

All concept art:
Submit the code CONC3PT