NEED FOR SPEED: MOST WANTED CHEATS

Unlock Porsche Cayman:
Press L1, R1, R1, R1, Right, Left, Right, Down at the "Press Start" screen.

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

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

Unlock Burger King challenge:
Press Up, Down, Up, Down, Left, Right, Left, Right at the "Press Start" screen. Complete the challenge and you will be able to use all Junkman parts on cars you have in "My Cars".

Bonus $10,000:
To get an extra $10,000 in career mode, have a Need For Speed Underground career game saved on your memory card. After the prologue you will get $10,000.

Unlock Additional cars:
Defeat the indicated Blacklist Boss to win the corresponding car.

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

Most Bounty possible:
Try to start a pursuit near the bus depot. Then run through the glass and up the ramp on the right. Go outside on the roof and stay there. The police will only go up there if you start to go down. You cannot be busted and the helicopter cannot push you off. Doing this you can get all time milestones and get A LOT of bounty.
(supplied by: blueviper12321)