PS2There is a Cheats section under Options. Enter these in exactly and most will also work on the Xbox version!
Agro (Special Move For SUVs And Trucks)
dfens
Bunny Ears (On Motorbike Rider)
getheadl
Faster Pedestrians
urbansprawl
Flaming Head (On Motorbike Rider)
trythisathome
Increase Car Mass In Arcade
hyperagro
No Damage
ontheroad
Pumpkin Head (On Motorbike Rider)
getheadk
Smiley Face (On Motorbike Rider)
getheadj
Snowman Head (On Motorbike Rider)
getheadm
Unlocks More Areas
roadtrip
Zone (Special Move For Sport Bikes, Tuners And Exotics)
allin