All Cars and Tracks: Insert the gam disc, and as the game loads, press up, down, left, right, A.

Begin a game, and after you select a car and track, the game will begin to load. Enter these cheats:

Bot Gang Up: down, up, A
Enable Jumps: left, right, A
Infinate Nitro's: right, left, A
Kill A.I.: left, left A