This Magnaflow performance exhaust for the LS1 powered 2004 Pontiac GTO is the perfect addition to take your Goat to the next level and add a muscle car rumble. This full stainless steel system features: 2 1/2 mandrel bent tubing; polished 3 stainless steel tips; Tru-X pipe; 4 inch x 9 inch x 11 inch polished stainless steel muffler; 3 inch rolled polished stainless steel exhaust tips.