This is one of the parts on the Miyata that is quit a bit different than any of the other bikes I have. The header pipe is conventional, but the main exhaust expansion chamber has a mount built into it, and a silencer. The rear part of the expansion chamber actually fits over the end, and is secured with a nut that attaches to the long threaded rod sticking through the middle.
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Main diameter is 1", then expands to 2.75".
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