All cars:
Enter YAYCARS as a code.
All tracks and mini-games:
Enter IF900HP as a code.
Maters Speedy Circuit and Maters Countdown cleanup:
Enter TRGTEXC as a code.
Super fast start:
Enter IMSPEED as a code.
Unlimited boost:
Enter VROOOOM as a code.
All paint jobs:
Enter R4MONE as a code.
All movies:
Enter WATCHIT as a code.
All concept art:
Enter CONC3PT as a code.