Midtown Madness 3 cheats and cheat codes for XBox

Unlock all cars:
Click and hold the Left thumb-stick and push 
L, R, L, L, L, R, R, R, L, L, R, R at the car selection screen 
to get access to all cars.

Unlocks:
Washington Police: Finish the Police Officer job in Washington DC 
Washington Police car: Finish the Police Officer job in Washington DC 
Washington Bus: Win the first 3 Checkpoint races in Washington DC 
Taxi: Finish the Taxi Driver job in Paris. 
Saab 9-3 Turbo: Win the Checkpoint race 10 in Paris. 
Paris Police: Finish the Police Officer job in Paris. 
Paris Bus: Win the first three Checkpoint races in Paris. 
Mini Cooper S: Finish the first three Blitz races in Paris. 
Lotus Esprit: Win Blitz race 10 in Paris. 
Limousine: Finish the Chauffeur job in Paris. 
Koenigsegg CC: Finish all jobs and win all races. 
Hummer H2 SUV: Finish the Salesman job in Washington DC 
Hummer H2 SUV: Finish the Salesman job in Washington DC 
Freightliner Century Class: Win the first six Blitz races in Washington. 
Ford Mustang 2+2 Fastback: Finish the Stunt Driver job in Washington DC 
FLE: Finish the Delivery Man job in Paris . 
Fire Truck: Win the first 6 Checkpoint races in Paris. 
Dodge Viper SRT-10: Finish the Private Eye job in Washington DC 
Chrysler PT Turbo: Finish the Rental Car Driver job in Washington DC 
Chrysler Crossfire: Win the Blitz race 10 in Washington DC 
Chevrolet SSR: Win the first three Blitz races in Washington DC 
Chevrolet Corvette Z06: Win the checkpoint race 10 in Washington DC 
Cement Truck: Win the first six Checkpoint races in Washington DC 
Cadillac Escalade Finish the Limo Driver job in Washington DC 
Cadillac Eldorado Seville: Finish the Pizza Delivery job in Washington DC
Audi TT: Finish the Special Agent job in Paris. 
Audi S4 Avant: Win the first six Blitz races in Paris. 
Armored Car: Finish the Security Guard job in Paris. 
Ambulance: Finish the Paramedic job in Paris.