Virtually indestructible 100 percent 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 (see the big PowerPickle). No sealant or gaskets required. 58 inch thick flanges never warp. Flanges welded both sides, then milled flat. Includes stainless Y - pipe assembly with a seamless Y - collector. Includes necessary heat shielding. Banks streamlined, stainless steel TorqueTubes are the industry's only parallel 5 - tube exhaust manifolds for RVs. Unlike competitors who add a separate tube length to a 4 - tube formation, Banks integrates five tuned - length tubes into a design that allows rotational firing of the cylinders through the exhaust, minimizing backpressure and maximizing torque. The thick, 58 inch flanges never warp or leak. Maximize exhaust extraction and torque. And check out that amazing Power Pickle 5 - Year Limited Warranty