Need for Speed Carbon had some cars exclusive for download and on the Collectors Edition. The issue is that they were never released for the PS3 version originally, only for Xbox 360 and PC. This cars were already on disc but unobtainable on the PS3.
For Need for Speed Carbon on the PlayStation 2, Guide and Walkthrough by buicalaurentiu. PS2/PS3 WII/Gamecube/MOBILE Release date: November 1st 2006 Version: 1.0

The bottom line is that if you are looking to waste some time, buy Need for Speed Carbon. But if you are looking for an innovative game that stretches your PS3 to the limits, it is not for you. However, that being said -- sadly this may be the best racing game currently available for the PS3.

Need for Speed: ProStreet (PS3) Cheats. Need for Speed: ProStreet cheats, Passwords, Unlockables, and Codes for PS3. Have a game save of NFS Carbon; having 2 saves will still get you $10,000:
For Need for Speed Carbon on the Xbox, GameFAQs hosts box shots, plus game information and a community message board for game discussion. Cheats. Reviews
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need for speed carbon ps3 codes