Muffler replacement huge horsepower gains!

[Rare Iron]

Originally Posted by 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

Dave, I'm not really sure what this can be. I would suspect the louvers in the flowpath are creating this, but if someone running mufflers with smooth perf cores are having the same effect, then that would blow my theory out of the water. I've heard of other sounds described on decel & in-between shifts on manual cars - like backrapping, popping, etc. This is not limited to my mufflers. If you listen to the Z06 Corvette on my website, he is running 3" Powersticks x 20" long, & he accelerates from 30 MPH to 140, then takes his foot off the gas for an extended decel. NO popping or fluttering at all, AND he was not even running tailpipes - the exhaust was dumping under the car! I did not expect it to sound that clean. He was also running into the louvers as suggested.