Need For Speed Most Wanted cheats and cheat codes for Xbox 360

Unlock Castrol Ford GT:
At the "Press Start" screen, enter Up, Down, Up, Down, Left, Right, Left, Right.

Unlock Castrol Syntec Ford GT:
At the "Press Start" screen, enter Left, Right, Left, Right, Up, Down, Up, Down.

Unlock Free Upgrades
At the "Press Start" screen, enter Up, Up, Down, Down, Left, Right, Up, Down.

Unlock Burger King challenge:
At the "Press Start" screen, enter Up, Down, Up, Down, Left, Right, Left, Right.

Unlock Junkman Engine
At the "Press Start" screen, enter Up, Up, Down, Down, Left, Right, Up, Down.

Unlock Porsche Cayman 
At the "Press Start" screen, press LT, RT, RT, RT, Right, Left, Right, Down


Unlock extra cars:
Defeat the indicated boss to win the extra car. 

Extra car - Task
Vauxhall Monaro VXR - Beat Boss 10 
Toyota Supra - Beat Boss 13
Subaru Impreza WRX STi - Beat Boss 9
Renault Clio V6 - Beat Boss 13
Porsche Cayman S - Beat Boss 10
Porsche Carrera GT - Beat Boss 3
Porsche 911 Turbo S - Beat Boss 5
Porsche 911 Carrera S - Beat Boss 7
Pontiac GTO - Beat Boss 10
Mustang GT - Beat Boss 12
Mitsubishi Lancer Evolution VIII - Beat Boss 11
Mitsubishi Eclipse - Beat Boss 14
Mercedes-Benz SLR McLaren - Beat Boss 3
Mercedes-Benz SL 500 - Beat Boss 11
Mercedes-Benz CLK 500 - Beat Boss 8
Mazda RX-8 - Beat Boss 12
Mazda RX-7 - Beat Boss 9
Lotus Elise - Beat Boss 8
Lamborghini Murcielago - Beat Boss 4
Lamborghini Gallardo - Beat Boss 6
Ford GT - Beat Boss 4
Dodge Viper SRT 10 - Beat Boss 6
Corvette C6.R - Finish 100% of the game
Corvette C6 - Beat Boss 5
Cadillac CTS - Beat Boss 12
BMW GTR (Race version) - Beat Boss 1
Audi TT 3.2 Quattro - Beat Boss 15
Audi A4 3.2 FSI Quattro - Beat Boss 14
Audi A3 3.2 Quattro - Beat Boss 15
Aston Martin DB9 - Beat Boss 7

Get Xbox Live gamer points:
Complete the following tasks in single player career mode to earn the 
indicated number of points.

Beat Wes Allen "Webster" (75 points) - Beat Boss 5
Beat Vince Kilic "Taz" (10 points) - Beat Boss 14
Beat Victor Vasquez "Vic" (10 points) - Beat Boss 13
Beat Toru Sato "Bull" (200 points) - Beat Boss 2
Beat Ronald McCrea "Ronnie" (100 points) - Beat Boss 3
Beat Lou Park "Big Lou" (25 points) - Beat Boss 11
Beat Kira "Kaze" Nakazato (25 points) - Beat Boss 7
Beat Karl Smit "Baron" (25 points) - Beat Boss 10
Beat Joe Vega "JV" (85 points) - Beat Boss 4
Beat Jade Barrett "Jewels" (25 points) - Beat Boss 8
Beat Isabel Diaz "Izzy" (10 points) - Beat Boss 12
Beat Ho Seun "Sonny" (10 points) - Beat Boss 15
Beat Hector Domingo "Ming" (25 points) - Beat Boss 6
Beat Eugene James "Earl" (25 points) - Beat Boss 9
Beat Clarence Callahan "Razor" (350 points) - Beat Boss 1