This axle-back exhaust system is constructed of 3-1/2" - 4" mandrel-bent 409 stainless steel tubing for maximum strength and durability. Finishing off this exhaust system is a 6" diameter polished stainless steel clamp-on exhaust tip. The tip features an aFe POWER logo plate riveted on for a unique style. This system produces a throaty sound unleashing all available horsepower and torque. 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. Utilizing state-of-the-art computer-aided design technology, this exhaust system is designed for custom, high tolerance factory fitment. 100% MIG-Welded for race-proven strength and durability. Apollo GT Series 3-1/2 IN Stainless Steel Axle-Back Exhaust System w/ Polish Tip Ford F-250/F-350 17-24 V8-6.2/7.3L Ford F-250/F-350 17-24 V8-6.2/7.3L