Gibson Performance Exhaust 319010 Aluminized Axle Back Exhaust System Manufactured using aluminized, 2.5 inch mandrel-bent heavy-duty tubing with zinc plated factory style hangers, clamps and all necessary hardware for easy bolt on installation Gibson's superflow performance muffler delivers the powerful "big block" sound with increased power and torque 4 inch polished T304 stainless steel round slash cut tip Exit is straight out the back Lifetime limited warranty