The Simpsons - Hit And Run - Platform: XBox

Invincibility:
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At the options screen, hold L + R and press Y, A, Y, A. If you entered the code 
correctly, you will hear the sound of a horn.

All bonus cars:
---------------
At the options screen, hold L + R and press A, B, A, B. If you entered the code 
correctly, you will hear the sound of a horn. Note: You must have first 
completed all missions.

Fast cars:
----------
At the options screen, hold L + R and press X(4). If you entered the code 
correctly, you will hear the sound of a horn.

Very fast cars:
---------------
At the options screen, hold L + R and press Y(4). If you entered the code 
correctly, you will hear the sound of a horn.

Red brick car:
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At the options screen, hold L + R and press B(2), Y, X. If you entered the code 
correctly, you will hear the sound of a horn. The secret vehicles normally found 
in each level will now be a small red brick car.

Super jumps:
------------
At the options screen, hold L + R and press X(3), Y. If you entered the code 
correctly, you will hear the sound of a horn. Sound the horn to jump extra high.

Instant vehicle explosions:
---------------------------
At the options screen, hold L + R and press Y(2), X(2). If you entered the code 
correctly, you will hear the sound of a horn.

Display speedometer:
--------------------
At the options screen, hold L + R and press Y(2), B, X. If you entered the code 
correctly, you will hear the sound of a horn.

Grid view:
----------
At the options screen, hold L + R and press B, A, B, Y. If you entered the code 
correctly, you will hear the sound of a horn.

Alternate views:
----------------
At the options screen, hold L + R and press B(3), A. If you entered the code 
correctly, you will hear the sound of a horn.

Psychedelic view:
-----------------
At the options screen, hold L + R and press Y, B, Y, B. If you entered the code 
correctly, you will hear the sound of a horn.

Alternate credits audio:
------------------------
At the options screen, hold L + R and press A, X(2), Y. If you entered the code 
correctly, you will hear the sound of a horn.