Porsche 356 Cabriolet rev (Subdivision ready 3D model) is available on CGTrader for $69. Original author: dragosburian. Specs: 202451 polys, 200931 verts.
STL (Stereolithography, filesize: 10.1 MB), OBJ (OBJ, filesize: 12.4 MB), BLEND (Blender, filesize: 12.3 MB), DAE (Collada, filesize: 16.5 MB)