Not to sound like a broken record, but a Basalt fiberplate could attach directly to the muffler.
duckduckgo.com/?q=basalt+fiber+plate+high+temperaturei&ia=web
Sukhoi use them in jet engines.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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