UNLOCKAllTHINGS
OK type in the secret code 'UNLOCKALLTHINGS' and then instead of restarting the ps3 get out of your carrer and go back in (do this way because it's quicker to do than resartin the whole ps3.) and all the cars you unlocked should be there if you sell the you will probably get around 90,000 dollars.
More tricks, tips and cheats for this game are right here - Need for Speed ProStreet cheats
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