Type "WYRED" at the Begin Career name entry screen for a wire-framed car.
Type "PRESSSTART" at the Begin Career name entry screen for a new opponent.
Type "PHATCARS" at the Begin Career name entry screen for obese cars.
During gameplay, press Pause. Highlight Race Statistics, then press and hold R + C or R + L + A to bring up the cheat menu.
wyred Wire-frame mode
phatcars Very fat cars
pressstart A new opponent
Bonus Racing Cars
Type "GO BRUINS!" at the begin career name entry screen for six new indy racing cars.
Begin your game in begin career then as your name put in go bears! for seven or six cars or put your name in as go bruins! for seven or six secret cars not really but you get to pick the car you want from a selection.