HighEnd H Series Tri Y Long Tube V2 Header H22 H23 Highest power gains 1 piece design, No installation headaches like multi piece headers No ground clearance issues often associated with aftermarket headers 2.5 inch collector (uses type R gasket) Full stainless steel construction Street and track proven Works with power steering and A/C (slim fan recommended) Very broad power band No chance of leaks due to fasteners coming loose CNC machined flange Comes with all the gaskets and flanges with hardware!