Can anyone that has beat need for speed carbon answer this please?

ive got the game and ive almost beat darius but ive never gotten the pagani zonda f ,the koenigsegg ccx, or the shelby gt 500.can you tell me why?ive only played it on a ps2|||You can only get the Pagani by downloading the game from EA's website. The CCX is only available in the Special Edition version of the game. The Shelby is unlocked when you finish the Diamond Hills course.