C-Down		Punisher 
C-Up 		4x4 Monster 
C-Left 		Thunderbolt 
C-Right 	The Crusher 

Flagstaff Track:
At the Track Select screen, hold Left on the controller and press the L button to access the hidden Flagstaff track. You should hear an air wrench if it worked. To play the Flagstaff track, select Mojave and hold the Z button and press the gas button.

Guadalupe Track:
At the Track Select screen, hold Down on the controller and press the R button. You should hear an air wrench if it worked. To play the Guadalupe track select Vegas and hold the Z button and press the gas button.

Thanks to Revolution readers Justin Green, Kevin, Gordon Misner, kx208, wwjd smw18 and ropto2!