Burnout cheats and cheat codes for Gamecube

Unlock every racers
At the options screen, press X + Y + B

Unlock Free Run mode, Free Run Twin mode, Credits options
Finish the game once.

Unlock Face-off mode against the Roadster:
Finish championship mode once

Unlock Bus: Beat the bus in Face Off four
Unlock Roadster: Beat the Roadster in Face Off mode
Unlock Saloon GT: Beat the Saloon GT in Face Off three

Get Full bonus
Drive a lap without a single accidents

Unlock Towtruck
Play in championship mode and unlock Face Off Two,
after beat the Towtruck once.