Custom Cars Rapidshare How Can You Make Custom Cars For Need For Speed Most Wanted?

How can you make custom cars for Need for Speed Most Wanted? - custom cars rapidshare

I wonder if there is a way, the cars for Need for Speed: Most Wanted or Need For Speed: Carbon?
What I really want is a police car.
So I was wondering if there is a way to do this for the PS2 version of the game