Clicik Left thumb stick,Right thumb stick,then (on the D-pad), press down,left,down,left,Then B,Y,Start button. You should hear a sound but you might have to re-do it a couple of times.

Press Y, A, X, B, Left Thumb Stick, Right Thumb Stick, Black, White, Right Trigger, Right Trigger.

Unlimited turbo:


Press Up(2), Down(2), Left, Right, Left, Right, B, A at the "Start Game" screen, then press Start. A sound will confirm correct code entry. Note: If the code does not activate the first time, reset the Xbox and try again. To enter another code, remain on this screen until the game returns to the "Start Game" screen on its own.