Crashed cheats and cheat codes for XBox

Cheat mode - Unlock all hidden option:
During the loading screen (when you see the mission text), push
Up, Down, Left, Right buttons on your contoller. If the code is 
accepted, you will see a message at the bottom right corner of 
the screen. Alternate cheat code: Up, Down, Left, Right, A.

Opponents only attack you
During the loading screen (when you see the mission text), push
Down, Up, Right, B buttons on your contoller. If the code is 
accepted, you will see a "Bot Gang Up" message at the bottom 
right corner of the screen. Alternate cheat code: Down, Up, A.

Kill AI
During the loading screen (when you see the mission text), push
Left, Left, Down, B buttons on your contoller. If the code is 
accepted, you will see a "Kill AI" message at the bottom right 
corner of the screen. Alternate cheat code: Left, Left, A.

Jumping car
During the loading screen (when you see the mission text), push
Left, Right, Up, B buttons on your contoller. If the code is 
accepted, you will see a "Jumps" message at the bottom right 
corner of the screen. Alternate cheat code: Y, Left, Right, A.

Unlimited nitros
During the loading screen (when you see the mission text), push
Right, Left, Down, B buttons on your contoller. If the code is 
accepted, you will see a "Infinite Nitros" message at the bottom 
right corner of the screen. Alternate cheat code: Right, Left, A.

Disable nitros
During the loading screen (when you see the mission text), push
Right, Left(2), A buttons on your contoller.

Addtional codes
During the loading screen (when you see the mission text), push
buttons randomly (Left thumb-stick, L, R, A, B, X, Y, White, Black) 
and you just may unlock a cheat message at the bottom left corner.
Some examples include Kill All, Bot Gang Up, Monster Tires and 
Tiny Cars.