Virtually indestructible 100% 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. Exclusive tuned-length parallel 5-tube design. Patented PowerPickle pulse converter. 5/8 inch thick flanges won't warp or flex. Includes Y-pipe & heat shielding. 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