[undy]

Eric, The flutter occurs when the mufflers are installed as they are intended, for max sound attenuation. When I installed the inserts before, with the louvers being ineffective for max flow and minimal sound attenuation, there was no flutter. This flutter issue is very wide spread, not just your systems (no pot shotz at CC intended here at all, I've always been happy with your stuff and customer support).

You have any thoughts on this flutter issue??

Dave