1966 Pontiac GTO (Subdivision ready 3D model) is available on CGTrader for $89. Original author: pixelinside. Specs: 150000 polys, 164000 verts.
MAX (Autodesk 3ds Max, filesize: 6.73 MB), OBJ (OBJ, filesize: 29 MB), 3DS (3D Studio, filesize: 19.2 MB), LWO (Lightwave, filesize: 23.9 MB)