Unlock Burger King Challenge:
Enter Up, Down, Up, Down, Left, Right, Left at the 'Title' screen.

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

Unlock Porsche Cayman:
At the 'Press Start' screen enter L, R(3), Right, Left, Right, Down

Unlock Free Upgrades:
At the 'Press Start' screen enter press Up(2), Down(2), Left, Right, Up, Down.

Extra $10,000 in Career Mode:
Have a 'Need For Speed Underground' career game saved on your hard drive then after the prologue you will get $10,000.

Additional cars:
To win the following cars defeat the indicated Blacklist Boss

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