By 
Enter the main screen, then Extras. Use these codes to activate the effect:
GIVECASH 1 million credits
ELPUEBLO Big Rig
RAIDERS Ice Cream Truck
BIGTRUCK Mob Car
GIEVEPIX Unlocks All Cars and 1 Million Credits
GIVEALL Unlocks All Tracks
WOTKINS Unlocks Flatmobile Car
RUTTO Unlocks Pimpster Car
KALJAKOPPA Unlocks Rocket Car
GIEVCARPLZ Unlocks School Bus
