Yes Ken that has been my go to manual for years. However it is somewhat superseded now as they have worked out how to use a Helmholz resonator for significantly more boost. That is why you see such fat tuned pipes on the latest 2 strokes. I considered a helmholz resonator for active silencing on this setup but I need to know the frequency to design it at so that will need to wait. I wont need a tuned pipe on the Zeus as the DA 50 should have plenty of power without it.