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Cat Back Exhaust System 18-Pres Mustang GT Split Rear Quad Exit 3 in Quad UNBRANDED HSP4867OM- 77-78 Chevy Camaro/Pontiac FirebirdConstructed of 409 stainless steel, includes 304 stainless steel 3 inch tips backed by Pypes lifetime warranty. You get an ultra aggressive sound guaranteed to make the neighbors take notice. Features include: X Bomb Technology; Pypes exclusive mid muffler design; 3 inch mandrel bent 409 stainless steel; Interchangeable connection adapters to go from stock to full 3 inch; 3 inch oversized 304 stainless double wall tips; Easy installation using factory