aFe 49-34104-B Vulcan Series 3 IN to Dual 2-1/2 IN 304 Stainless Steel Cat-Back Exhaust SystemaFe 49 34104 B Vulcan Series 3 IN to Dual 2 1 2 IN 304 Stainless Steel Cat Back Exhaust System Now your Silverado Sierra can have that dual exhaust look with this aFe POWER Vulcan Series cat back exhaust system. 3" to dual 2 1 2" mandrel bent, 304 stainless steel tubing and high flow muffler improves performance across the power band and delivers a deep, aggressive exhaust tone. 100% MIG welded for strength and durability with quad 3 1 2" black 304