Change Speedometer

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

 Change Viewpoint

 To change your viewpoint while racing, press V.

 Drive the Yellow Car from the Pits

 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.

 No Car Damage

 To eliminate car damage, press X while racing.

 No Flags

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

 Rotating Map

 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.

 Strong Wheels

 For stronger wheels, type BRAVO while playing.

 View Frame Rate

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