the mesh is looking good to got to subd. it looks though, that there are a few triangles. it is really ok to have triangles, but if you can avoid them just leave a area as low quad poly as possible. if you are going to end up with subd and tweak the car in subd level - and you have absolutely no choice, put in 5 sided polygons instead of 3 sided ones. performance-wise quads are much better though. and you should not smooth your mesh in poly before going subd - subd will do that automatically.