Use the following cheats at the title screen:
Infinite nitrous: Left, Up, Left, Down, Left, Down, Right, Square.
Infinite crew charge: Down, Up(2), Right, Left(2), Right, Square.
Infinite SpeedBreaker: Down, Right(2), Left, Right, Up, Down, Square.
Need For Speed Carbon Logo Vinyls: Right, Up, Down, Up, Down, Left, Right, Square.
Need For Speed Carbon Special Logo Vinyls: Up(2), Down(4), Up, Square.