I have front 13" cobras and was going to get the rear cobra rotors and calipers but see on ebay for a couple hundred a bracket that relocates the factory rear caliper and allows 13" rotor to be used on the rear. Would the only advantage of this upgrade be cosmetic, in that both front and rear rotors would match?lol. Car already stops pretty decent with drilled/slotted brembo's all the way around and cobra calipers up front. Thanks guys!