Check out Audi RS6 3D model on CGTrader for $69. High-quality mesh by Mavi3D: 565000 polys, 575000 vertices. Textured.
OBJ (OBJ, filesize: 14 MB), FBX (Autodesk FBX, filesize: 24.3 MB), JPG (JPG, filesize: 115 MB), MAX (Autodesk 3ds Max, filesize: 76.4 MB)