You talking the stock muffs or the Prochamber?? I had an H before and hated it as it popped at hi revs... I have Spintech Sportsmans also but I prefer my OEM mufflers to keep the drone away...and the cops too...
The 19's been easy.. I swapped all kinds of stuff around and it still idles around 850-900 and no surging alt all.. It does get funky caome late Fall... It will surge then unless it hold the revs at 1500 or so for a few minutes then I'll idle fine...
Its got a nice mid range pull to it... Its a nice cam..