Virtually indestructible 100 percent stainless TorqueTubes maximize exhaust extraction, unleashing gobs of torque. Exclusive exhaust manifolds tuned specifically for motorhomes. Bulletproof 100 percent stainless construction. Ultra-thick, 5/8 inch flanges welded on both sides and machined perfectly flat. Fits so tight, it mounts without need for sealant or gaskets. Seamless pulse extractor tuned to pull exhaust and slash backpressure. Stainless Y-pipe assembly with seamless Y-collector. Designed to run cooler to protect expensive plug wires. No need for factory heatshields. 5-Year Limited Warranty. Torque Tube Exhaust Header System for use with Ford 460 Class A, Non-Catalytic Converter Key Features: Virtually indestructible 100 percent Stainless Steel Mandrel-formed tubes tune exhaust flow for maximum torque Maximize exhaust extraction Flanges welded on both sides, then milled flat Seamless high-velocity collector Pulls exhaust and slashes backpressure Tuned specifically for motorhomes 5/8 inch thick flanges won't warp or flex No sealant or gaskets required Includes Y-pipe, head pipe and heat shielding Designed to run cooler to protect expensive plug wires No need for factory heat shields US Patent #6,634,171 B1 CARB E.O. Not Required