XGRA: Extreme G Racing Association Cheat Codes for Gamecube

O2 Liveried:
Enter UCANDO as a cheat code.

Programmer message at the end of the credits:
Enter MUNCHKIN or EDDROOLZ or EDDIEPOO as a cheat code.

All Racing Levels:
Enter FREEPLAY as a cheat code.

All tracks:
Enter WIBBLE as a cheat code.

Templar
Complete season mode with all first place wins, and all objectives completed.