For the last couple hundred hours I have been using a Flowmaster Hushpower II muffler. Also used by Tracy and some others I think. It is done. The outside held up wery well, but I reciently removed it and discovered that the insides have entirely disientigrated. Whatever they used as packing has turned to a heavy clay-like substance ratteling around in the bottom. She steel mesh is in pieces. I had been thinking that the plane was not as quiet as it seemed 2 years ago.. go figure.
So I was thinking about one of the DNA Mufflers someone mentioned. They seemed nice because there is no packing, just steel dividers. Unfortunately, it is a little to big around to fit in my current set up. Instead, I ordered this muffler that also has steel innards but no packing:
It is nice because it is going to be smaller and lighter than the flowmaster (or the DNA), as well as less expensive - even the SS version that I ordered.
Will report back in 2 years on its performance :-)
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David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net