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Looks good!
I built a similar one using single in and out, but it's a little too loud. Apparently, the dishes rattle in the kitchen cupboards (hehe).
I was also intested in packing material but unable to find anything convenient. Years ago I saw a race shop build a muffler and wrap the internal pipes with header wrap tape and stainless lock wire. Their internal pipes had lots of large perforations, est 3/8".
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