First, to enable the cheat codes you need to plug a second controller into port two on your Xbox and then take it back out. Next, on your first controller enter X, X, Y, Y, B, B, A, A. Once thats all done you can enter the following codes to cheat your way through the game.
Then: On the first controller push down on the left thumbstick twice (as in click it in, not push it in the down direction), right stick twice, left stick twice and right stick twice. Youll hear a guitar strum confirming that you've entered the code correctly. Enter this code in multiple times for even more Moolah.
During game play, insert a controller in port 2. Remove the controller from port 2 and then press the following buttons on Controller 1: X, X, Y, Y, B, B, A, A. A sound confirms the code entry. These cheats have been tested and work, they are a little difficult to enter.
Invincibility: Enter cheat mode and enter the following on controller 1: X, Y, A, B, X, Y. Your health meter will turn yellow.
$1000: Enter cheat mode and then enter the following on controller 1: Click Left Analogue, Click Left Analogue, Click Right Analogue, Click Right Analogue, Click Left Analogue, Click Left Analogue, Click Right Analogue, Click Right Analogue.