Motor Mayhem cheats and cheat codes for Playstation 2

Extra stuff:
At the aircraft carrier level, blow up all of the planes around you. There 
should be one big explosion. If you look close, a piece of the ship will be
missing. Go down and there will be a mini-nuke, chaingun, and health. 
Then to get out go through the blue portal.

Invincibility:
Hold L1 + R1 + L2 + R2 and quickly press Left, Right, Right, Circle, 
Square during gameplay in endurance mode.

Weapon eject:
Hold L1 and press X, X, Square during game play.

Shield:
Enable the "Instant Combo" option at the cheats screen. After, hold R1 and press 
Triangle, Square, Triangle, Square during gameplay. If you repeated the code,
that will increase the shield.

Unlock Buzzsaw:
Select the hard or very hard difficulty mode. Win Eliminator, Deathmatch, 
and Endurance ranks with the same character. 

Unlock City Canal stage in multiplayer and quick battle modes:
Finish the Deathmatch level in the normal mode

Unlock the Downtown level in multiplayer and quick battle modes:
Finish the Eliminator stages in the normal mode

Dual Carrier level:
Complete the Endurance, Deathmatch, and Eliminator modes with the same 
character under the hard or very hard difficulty settings to unlock the Dual Carrier 
level in multi-player and quick battle modes. 

Unlock Santa hats:
Modify the system date to Dec 21. through Dec 25.