I was looking at a sharp looking mustang at the lot here lately (I seem to be drawn to it for some reason, even though it's just a V6), and like some people have already stated, the wheels, especially the ones on the rear, look kind of small for the car. It looks like it needs some big wide tires on the back. I'm just wondering how far a person could go with wheel size before voiding the factory warranty, and does anyone know anything about an extended warranty?