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Fits 2013-2014 Mustang GT Mufflers are made of aluminized 409 stainless steel corrosion-resistant body with twin polished 304 stainless 4" diameter tips Mufflers are original equipment on 2013-2014 Mustang Shelby GT500 Throatier exhaust note Clamp-on installation Shelby GT500 rear lower valence includes installation hardware Cutting of original lower fascia required for installation of GT500 valence 50 state drive-by noise legal