Obj Format:
In 3 different resolutions ranging from 70786 to 534142 Polygons. Interior and exterior are saved separately so you can render the car also without the interior.
The lowest poly-version is the SubD. hull. So you can use it easily as SubD in Maya/XSI or any Programms supporting SubD.

3ds Format:
In 3 different resolutions ranging from 137071 to 1064291 Polygons. Interior and exterior are saved separately so you can render the car also without the interior.