Need for Speed Most Wanted cheats and cheat codes for Gamecube

Unlock Burger King Challenge in challenge series:
Press Up, Down, Up, Down,Left, Right, Left, Right on Start screen 

Unlock an Extra Marker for use in shop:
Press Up, Up, Down, Down, Left, Right, Up, Down on Start screen 

Unlock Castrol SYNTEC Ford:
Press Left, Right, Left, Right, Up, Down, Up, Down on Start screen 

Unlock Porsche Cayman:
Press L, R, R, R, Right, Left, Right, Down on Start screen

porsche cayman :
left right left right up down up down

Unlock new areas:
Defeat these Blacklist Racers 
Unlock Camden Beach track - Defeat the #13 on the Blacklist
Unlock Rockport City - Defeat the #9 on the Blacklist

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

Easy Money when You Sell a Car  
If you want to sell your car, go to a One-Stop Shop and reset all the 
exterior body parts to stock. You will get a trade-in credit for the old 
custom parts. After sell the car.

Untested cheat:
Unlock everything in the game:
Press L, L, L, R, Up, Down on Start screen
unlock all cars:x,x,L,L,R,R