At the main menu, type "icancheat" to enable cheat mode. Then, type one of the following codes at the indicated screen and press [Enter] to activate the corresponding cheat function. If you entered the code correctly, you will hear a voice.
Result
Screen
Cheat Code
No clipping mode Main menu clipped
Reckless mode Main menu reckless
Set number of laps Track selection lapset
Cloverleaf and Pepsi Planet tracks [Note] Track selection freeride
Accelerator, Frito's Twister, The Gambler, Drop zone, Neon Canyon Run, and Future City tracks [Note] Track selection freedrive
Expert mode Car selection takemeon
Xwave car Car selection widebodyopen
Jeff Gordon's car (at sponsor selection) Car selection redfury
Wraith car Car selection wildone
Note: Enable both these codes to access all tracks.