Codes
In options menu, go to cheat codes.
 
Cheat                 Effect
 
getheadj            Yellow smile 
allin                    Unlock Special Zone 
dfens                 Unlock Special Agro 
getheadm          Snowman head 
getheadn          Skull head 
getheadk           Pumpkin heads 
getheadl            Bunny ears 
ontheroad         Vechicles take no damage 
roadtrip             Unlocks Atlanta & Detroit 
crosscountry    unlock all citys in arcade mode 
fillmeup             Max Nitro 
trythisathome     If you typed it in correctly, your bikers head should be on fire. NOTE: This only works for Choppers and Streetbikes.