Need for Speed: Carbon Message Board  

Is there any way you can bring cars from bonus cars or custom cars to Career Mode by deleting a file or renaming a file or copying a file ? because if there is Pleeeeeeeez help!

I would love to have Carrera GT in Career Mode as one of my cars. ANYBODY WOULD!

You cannot do that, but you can use your Career cars in quick race mode. At the car select screen, just press the down key until you come to "Career cars". Then you can race your career car on Quick Race.