Chrysler is giving away some 3d car models here
The cars available are:
CHRYSLER: 2008 Sebring Convertible Limited
JEEP: 2007 Wrangler Rubicon 4x4 two-door
DODGE: 2008 Viper Coupe SRT10
Each data set includes 3D geometry, reference materials (photos, charts, graphics, etc.) HDRI domes, and photographic backplates for each vehicle, sheesh!
Very cool of them to give this stuff away! Be warned though, it's a lot of data, like a couple of Gigabytes worth! Also, most of the meshes are in Maya format, so you will need to convert them in something like Okino PolyTrans if you want to use them in Max.
here is a screenshot of one of the cars - i'll post up a render when I have time...