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XBox - Powerdrome cheats

Unlock Tache Telpan XSU-K0cc Racer:
At Vehicle selection screen 
Hold R + L and push black, white, X, X, Y buttons, then release R + L 
at the vehicle selection screen to unlock Tache Telpan XSU-K0cc Racer.
If the code is accepted, you will hear a sound.

Use Same Vehicles In System Link:
The game does not let you to select the same vehicles when racing in a 
multiplayer mode (LAN). To avoid this, all players must hold the Y 
button before selecting at the vehicle selection screen.