Cannondaleriders

does anyone here have any expierience with the trinity stage 4 exhaust kits(header and pipe). i have one and an HMF kit too and i don't know what would be the best performance wise. i have a 468(bored and stroked), tim's airfilter kit, and it's ported by tim. anyone ever dyno'd something with this combinating of engine and pipe that would have a good map for it?

also, what kind of gearing would you recomend? i ride some trails, but mostly field and dune riding with a lot of drag racing.