Well I think camatv nailed it on the head but I have a 4 mil with shearer oofs on it right now. but before I had cpi inframes and the shearers make like 4 horse more on the dyno, but the power cones later. I have also ridden my friends ported banshee with lrds and I really liked that it had some mid range to it, but the shearers and cpi's scream on the top end and kick ass!