This axle-back exhaust system is constructed of 3 IN - 2-1/2 IN mandrel-bent 304 stainless steel tubing for maximum strength and durability. This system features a high-flow 304 stainless steel muffler, producing a mild sound. Finishing off this exhaust system are dual 4 IN diameter polished 304 stainless steel clamp-on exhaust tips. The tips features a laser etched aFe POWER logo for a unique style. This system produces a mild sound unleashing all available horsepower and torque. Utilizing factory style 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. Vulcan Series 3 IN to 2-1/2 IN Stainless Steel Axle-Back Exhaust System Polished Ford Bronco 21-24 L4-2.3L (t)/V6-2.7L (tt) Ford Bronco 21-24 L4-2.3L (t)/V6-2.7L (tt)