Cheats for Burnout (XBOX)

Bus
Defeat the bus in Face Off 4.

Towtruck
Play in championship mode until you unlock Face Off 2 in the special options screen. Defeat the Towtruck once to unlock it.

Saloon GT
Defeat the Saloon GT in Face Off 3.

Ending bonuses
Successfully complete the game to unlock the Free Run mode (no vehicles on the road), Free Run Twin mode (two player Free Run), and Credits options.

Roadster
Defeat the Roadster in Face Off 1 to unlock it and Face Off 2 against another car.

Face Off option
Successfully complete championship mode once to unlock Face Off 1 against the Roadster.