To cycle your speedometer between MPH, KPH and none, type EC while playing.

To change your viewpoint while racing, press V.

To drive the yellow car you saw in the pit station, type CAR while playing. Don't do this if you're in the pits, though. The game will crash if you try.

To eliminate car damage, press X while racing.

To remove the flag from the corner, type NOFLAG while playing.

While playing, press M to bring up a view of the map then press R to rotate it.

Warning: this will reduce you to first gear.

For stronger wheels, type BRAVO while playing.

To view the game's frame rate (speed), type FRAME while playing.