aFe Vulcan Series 3 2.5in 304SS Exhaust Cat Back with Blk Tips 2019 GM Vulcan Series 3 IN to 3 1 2 IN Stainless Steel Cat Back Exhaust System Best Exhaust aFe Power Rebel Series 3" Stainless Steel Cat Back aFe 49 36068 B Vulcan Series 304 SS Cat Back Exhaust System with. This cat back exhaust system is constructed of 2 1 2 IN 3 IN mandrel bent 304 stainless steel tubing for maximum strength and durability. This system features a high flow 304 stainless steel muffler and acoustically tuned expansion chamber for a deep exhaust tone. Finishing off this exhaust system is a 4 IN diameter black 304 stainless steel exhaust tip. The tip features a laser etched aFe POWER logo for a unique style. This exhaust features an acoustically tuned expansion chamber for a deep exhaust tone. Utilizing a factory style flange and hangers this system is a direct bolt on system, which requires no cutting or modifications for a hassle free installation. State of the art computer aided design technology is utilized for precise vehicle fitment. 100% MIG Welded for race proven strength and durability. Features: Constructed from 2 1 2 IN 3 IN Mandrel Bent 304 Stainless Steel Tubing 4 IN Diameter Black 304 Stainless Steel Exhaust Tip Acoustically Tuned Expansion Chamber for a Deep Exhaust Tone Utilizes Factory Style Flange and Hangers for a Secure Fit 100% MIG Welded for Strength and Durability