Correct me if I am wrong. In Mike's pics I see deep dish wheels. Most guys I am aware of running a C4 rear do not narrow the half shafts. So C4 Cobras do not have deep dish wheel. But if it were narrowed that would mean a narrowed spring making it stiffer. The C3 does need to be narrowed.
http://www.clubcobra.com/forums/albu...pictureid=4151