Unlockables:

Unlock Castrol Cash:Down,up,left,down,right,up,X,B
Infinite Nitrous Upgrade:Left,up,Left,down,left,down,right,X
Infinite Speedbreaker upgrade:Down,rght,right,left,right,up,down,X
Unlock Nfs Carbon Logo Vynls:Right,up,down,up,Down,left,right,X
Unlock Nfs Carbon Special Vynls:Up,up,down,down,down,down,up,X
Enter these at the main menu.

Enter these in the main menu
Cheat | code
-------------------------------|------------------
Castrol Cash------------------>|Down,Up,Left,Down,Right,X,B
Infinite Nitrous Upgrade ----->|Left,Up,Left,Down,Left,Down,Right,X
Infinite Speedbraker Upgrade-->|Down,Right,Right,Left,Right,Up,Down,X
NFS Carbon Logo Vinyls-------->|Right,Up,Down,Up,Down,Left,Right,X
NFS Carbon Special Vinyls----->|Up,Up,Down,Down,Down,Down,Up,X
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Insider Tip |
Entering some codes requires patience,but if you have continued problems, | try entering a menu like My Cars and then returning to the Main Menu top | try entering these codes again. |
___________________________________________________________________________|

To unlock infinite nitrous, enter this cheat. Left,up, left,down,left,down,right,x

Enter at main menu:

Castrol Cash-Down,Up,Left,Down,Right,Up,X,B

Infinite NOS-Left,Up,Left,Down,Left,Down,Right,X

Enter At Main Menu, A Message Will Appear If Done Correctly.

This Cheat Can Only Be Used Once.

Code - Down,Up,Left,Down,Right,Up,X,B

Effect - You Get $10,000.

Enter At Main Menu, A Message Will Appear If Done Correctly.

Code - Down,Up,Up,Right,Left,Left,Right,X

Effect - Unlimited use of Crew Members Ability in Races.

Picking a certain car at the start of the game will allow you to unlock certain cars in Tier 2 and Tier 3.

Please note all of these cars you can also unlock by completing the game:

Chevrolet Camaro SS:

Tier 2- Dodge Charger SRT8

Tier 3- Old Shelby GT500


Mazda RX8:

Tier 2- VW Golf R32 (I think!)

Tier 3- Nissan Skyline GTR


Alfa Romeo Brera:

Tier 2- Mercedes Benz SL65 AMG

Tier 3- Porsche Carerra GT (YEAH!)

Mazda RX-7 pinkslip is the middle or last card (not sure)

Dodge Charger R/T pinkslip is the thrid slip to the left (one before the last)

Aston-Martin DB9 pinkslip is the 1st slip (the 1st one you can choose)