Cheatcodes:
Go to the "Bonus Awards" menu and type in one of the following.
A sound will be played, if it was done correctly:
metropolis -- All cars.
mynameisneo -- All Campaigns.
mynameismrsmith -- All Campaigns except 1.
inversion -- Mirror Mode.
wreckedonspeed -- All gametypes (except Soccer).
warpspeedmrsulu -- All levels.
givemetheguysback -- Unknown.
itisiwhoammad -- Unknown.
billythewhizz -- Unknown.
snar -- Unknown.