Maximum Nitro:
     Enter fillmeup as a code.

No damage:
     Enter ontheroad at the cheat menu.

Faster pedestrians:
     Enter urbansprawl at the cheat menu.

Increase car mass in arcade mode:
     Enter hyperagro at the cheat menu.

Argo special move:
     Enter dfens at the cheat menu.

Zone special move:
     Enter allin at the cheat menu.

Roar special move:
     Enter Rjnr at the cheat menu.

Chrome head:
     Enter haveyouseenthisboy at the cheat menu.

Flaming head:
     Enter trythisathome at the cheat menu.

Yellow smile head:
     Enter getheadj at the cheat menu.

Pumpkin head:
     Enter getheadk at the cheat menu.

Bunny head:
     Enter getheadl at the cheat menu.

Snowman head:
     Enter getheadm at the cheat menu.

Unlock all cities in arcade mode:
     Enter crosscountry at the cheat menu.

Unlock Atlanta & Detroit:
     Enter roadtrip at the cheat menu.