Enter the follwing codes at the main menu:
Password ................................ Effect
Up(2), Down(4), Up, 1 ................... Cardboard box and driver vinyl
Down, Up, Left, Down, Right, Up, 1, B ... Extra Cash- This code can only be used once.
Right, Up, Down, Up, Down, Left, Right, 1 Need For Speed Carbon vinyl
Down, Up(2), Right, Left(2), Right, 1 ... Unlimited crew charge
Left, Up, Left, Down, Left, Down, Right, 1 Unlimited nitrous
Down, Right(2), Left, Right, Up, Down, 1 Unlimited SpeedBreaker

Unlockables
Unlockable cars

Unlockable .............................. How to Unlock
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) ................. Clear all three Turf War races.
Mazda RX7 (Tuner) ....................... Defeat Kenji in Boss Battle mode.
Nissan 240SX (Tuner) .................... Clear all three Checkpoint challenges.

Unlockable crew members

Unlockable .............................. How to Unlock
Colin ................................... Defeat Wolf/TFK
Nikki ................................... Defeat all three beginning Bosses
Samson .................................. Defeat Angie/21st Street
Yumi .................................... Defeat Kenji/Bushido