2-1/2" - 2-1/4" 409 Stainless Steel Construction:This system is constructed of 2-1/2" - 2-1/4" mandrel-bent 409 stainless steel tubing for maximum strength and durability.Dual High Flow Catalytic Converters:Includes dual high flow catalytic converters which are less restrictive than the factory converters providing maximum flow.Heavy Duty Flanges:Factory style laser cut mild steel flanges are used for a secure leak-free seal.Installation:Utilizing factory style flanges this system is designed to fit in the stock locations with no cutting or modifications required for a hassle-free installation.Computer-Aided Design:Utilizing state-of-the-art computer-aided design technology, this system is designed for custom, high tolerance factory fitment.MIG-Welded:100% MIG-welded for race proven strength and durability.