Choose Tournament and when the Select Player screen appears, choose any 'empty' slot. When the Initials Screen appears, enter the passcode holding down the Z button and pressing the L Button to enter the foolowing:
R R T A N G E N T A B A C U S
You must hold Z when you highlight end, and press L, the letters OK will appear in the corner of the screen if entered properly. Release Z and enter your initials.
Start a race, and press Start to pause, at the pause menu, enter:
Left, Down, Right, Up on the D-Pad and a new option: Game Cheats will appear.