That car looks great, but holy hell, how many polys is that? It's great to see the tail lights modeled in and whatnot, but those 4 tires alone look very dense.
I'm currently using a normal map for my tire treads. But I need to experiment more and try to get it to look a little better. Mainly tweak my HP Geo to capture the normals/depth better.
I thought the import limit on a single mesh was 64k verts? This seems more than that, but it's hard to tell without the wireframe. Maybe this is alot more optimized than it appears.