thanks i was just wondering cus i want to put one on mine but no one seems to have an o/r with flo's so the advice is greatly appreciated

 

^^^ at some rpms it sounds tinny or trumpety, but at other rpms (and WOT especially) it's heaven...actually I'm surprised my neighbors haven't complained...the 1500 rpm fast-idle cold-start is especially loud...
...p.s. supposedly the H sounds deeper but the X is raspier and might yield an extra 2-3hp...like I said I bought used, kind of an impulse thing, so I didn't have a choice...