Extra money:
     Press  Down,  Up,  Left, Down, Right, Up, Square, Triangle at the
main menu. Note: This code can only be used once.

Unlimited crew charge:
     Press Down, Up, Up, Right, Left, Left, Right, Square at the main menu.

Unlimited nitrous:
     Press Left, Up, Left, Down, Left, Down, Right, Square at the main
menu.

Unlimited SpeedBreaker:
     Press  Down,  Right,  Right, Left, Right, Up, Down, Square at the
main menu.

Need For Speed Carbon vinyl:
     Press Right, Up, Down, Up, Down, Left, Right, Square at the main menu.

Cardboard box and driver vinyl:
     Press Up, Up, Down, Down, Up, Square at the main menu. 

Unlock Collectors edition cars:
     Complete the following tasks in the Challenge Series

Muscle car:
     Dodge  Charger  RT  Classic  unlocked  - Beat the 21st Muscle Car
Gang.

Tuner cars:
Nissan 240SX unlocked - Complete all 3 Checkpoint challenges. 
Mazda RX7 unlocked - Beat Kenji in Boss Battle mode. 

Exotic cars:
Jaguar XK 2007 unlocked - Complete all three Turf War races. 
Aston Martin DB9 unlocked - Beat Wolf in Boss Battle mode. 

Get bonus Burnout vinyl:
     Have  a  saved game file from Burnout Revenge on your memory card
then go to the bonus section of the vinyls.

Get $10,000 bonus cash:
     Have  a saved game file from NFS: Most Wanted on your memory card
then start the career mode.

Easy wins:
     Use a scout (example: Yumi) in races where crew members are used.
If you do not win the 1st place on the race, your scout will.

Crew members:
Neville - Available at start.      
Sal joins - Play at least six races.
Yumi joins - Beat Kenji/Bushido.
Colinjoins - Beat Wolf/TFK.
Samsonjoins - Beat Angie/21st Street.
Nikki joins - Beat all three beginning Bosses.