At the Main Menu, press Shift and type any of the following "Codes":
Code - Granted Wish
ALLRDIFFERS - All Rear Differentials
ALLFDIFFERS - All Front Differentials
ALLTIRES - All Tires
BIGFOOT - Toyota Hilux Bigfoot
ALLTROPHIES - All Trophies Access
ALLCARS - All Cars
RABACAR - Raba Truck
ALLENGINES - All Engines