I was looking at an SLP hp dyno graph between stock and their pipe and found a couple things that were interesting. First off the motor pulls extremely hard between 7000 and 7600 rpm and then the power gain fades off and slowly rises up to 8200. Is this the reason for the hard hitting mid range and lack luster top end? That we can't fix, but my second observation we can. I noticed that after 7200 rpm the power drops like a rock. It looks like by 7400 rpm the hp is down to the low 130's to 130 hp. Betwween 7800 and 8000 rpm it only loses 5 at the most. IMO, shooting for a peak rpm of 8000( 8100 at the most) is where we should be to ensure not going over 8200. Just my $.02!