At the main menu, press SELECT to access the "Enter Code" screen, then enter any of the following code: (Note: Some of the code can't be dis abled unless you reset the game data at the option menu)
Password Effect BIGUNS Combines the effects of all above codes LOGRAV Low Gravity BIFFIN Max. Upgrades for all cars ALL4ME Unlock all Teams CUPIUP Unlock all Tracks and Cups IAMCAR Weird Sound Effects
Contributed By: shadowcore76.
Right when the number 1 appears, press A and hold it to get a boost at the start of the race.
Contributed By: CpuBot561.
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You can submit a problem report for any non-working or fake code in the lists above.