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Infinite nitrous
At the title screen, press Left, Up, Left, Down, Left, Down, Right, Square.
Infinite crew charge
At the title screen, press Down, Up(2), Right, Left(2), Right, Square.
Infinite SpeedBreaker
At the title screen, press Down, Right(2), Left, Right, Up, Down, Square.
Need For Speed Carbon Logo Vinyls
At the title screen, press Right, Up, Down, Up, Down, Left, Right, Square to unlock the Need For Speed Carbon Logo Vinyls.
Extra money
At the title screen, press Down, Up, Left, Down, Right, Up, Square, Triangle to get an extra $10,000 in Career mode.
On succesfully entering any of these codes, you'll receive a message.
Collectors Edition cars
Successfully complete the indicated event(s) in the Challenge Series to unlock the corresponding car:

• Aston Martin DB9 (Exotic): Defeat Wolf in Boss Battle mode.
• Dodge Charger RT Classic (Muscle): Defeat the 21st Muscle Car Gang.
• Jaguar XK 2007 (Exotic): Successfully complete all three Turf War races.
• Mazda RX7 (Tuner): Defeat Kenji in Boss Battle mode.
• Nissan 240SX (Tuner): Successfully complete all three Checkpoint challenges.

Crew members
Successfully complete the indicated task to unlock the corresponding crew member:
Sal: Successfully complete four to six races
Yumi: Defeat Kenji
Fast Money
Upon completing Career mode, use Samson as your wingman with Neville in your crew. You can repeat all the races where you used a wingman, and using a wingman net's you an extra $250. You can gain the bonus on first time races as well.
Maximizing Speedtrap advantage
Before Speedtrap races, activate your Blocker/Brawler. When coming up on a speed trap, stop your B/B. It will crash the other cars, and dramatically slow their time. The best time to use it is right before the Trap.