Just a thought... This sounds strange, but has anyone tried using the
ceramic "noodles" intended for canister aquarium filters (such as the
Eheim) in place of packed fiberglass?  I tried to melt one with my
oxy-acetylene torch and it just glowed red, but it didnt' melt.  Should be
stout enough for a rotary muffler.

Someone did.  They turned to dust.

Hans

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