I have head the Hushpower on a Flathead 8 (Ford). It was on H&H Flatheads' demo engine (inside the trailer
). With one of them off (accidentally) it was REAL loud, when we all noticed it was off, and it was 'reinstlled' it was quieter, but still had 98% or the rumble and rasp, just not as loud. I've been looking at a set for our Anglia (Bent 6, dual W an 'H' pipe). Have yet to take the plunge (other priorities at the moment).
I have heard people claim the Hushpower IIs have the same sound as the old 'Holywood' mufflers. I wouldn't know, just thought I should pass it on.
I have heard the 'meat grinder' or 'mini meg' tips help reduce the interior noise (haven't tried it, but stand's to reason).
