Maximizes Exhaust Extraction and Torque. Virtually indestructible 100% stainless TorqueTubes. Exclusive tuned-length parallel 5-tube design and Patented PowerPickle® pulse converter unleashes gobs of torque. Virtually indestructible 100% stainless TorqueTubes maximize exhaust extraction, unleashing gobs of torque. Exclusive tuned-length, parallel 5-tube exhaust manifolds designed specifically for motorhomes. 5-Year Limited stainless steel construction never cracks or blows. Mandrel-formed tubes tune exhaust flow for maximum torque. Patented PowerPickle® pulse converter maximizes exhaust extraction. No sealant or gaskets required. 5/8 inch thick flanges never warp. Flanges welded both sides, then milled flat. Includes stainless Y-pipe assembly with seamless Y-collector. Includes necessary heat shielding. 5-Year Limited Warranty