Max Format:
Meshsmooth is applied so you can set the object resolution as you like. Just use the Named Selection Set meshsmooth to select the SubD objects.

Obj Format:
In 3 different resolutions ranging from 146563 to 1675224 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 283906 to 3343492 Polygons.Interior and exterior are saved separately so you can render the car also without the interior.