This pipe is the ticket for a ported 800R motor. Gain 6 peak horsepower but even up to 10 mid-range horsepower on your ported motor just by adding this pipe. Works equally well at low or high elevation. Our 800R with this pipe, our porting, V-Force reeds, and a 2 degree timing key made a safe 175.7 horsepower on pump gas. Get the power you deserve by adding our new ported pipe!! Peak Power is from 8300-8400 RPM for this pipe.