aFe POWER Twisted Steel Y-Pipe w/Cat is constructed of mandrel-bent 409 stainless steel tubing for maximum strength and durability. High flow catalytic converters provide less restrictive exhaust flow than the factory converters. Factory style laser cut flanges are used for a secure leak-free seal. Designed to fit in the stock locations with no cutting or modifications required for a hassle-free installation. Utilizing state-of-the-art computer-aided design technology, this system is designed for custom, high tolerance factory fitment. 100% MIG-welded for race proven strength and durability. Product Features:409 Stainless Steel Y-Pipe Built for DurabilityTrue 2-into-1 Mitered Merge Collector Eliminates Dead Zone for Improved FlowMandrel-Bent Tubing for Smooth Transitions and Increased PowerOE-style flanges and Stainless Clamps for Improved Sealing Surface