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if you can, a vid of the bike may be helpful... looking at your MT250, i think the stock muffler may be rebuildable, and maybe the PO removed the packing or it just blew out or something... any fiberglass packed muffler will deteriorate, and do so at higher rates of speed when the bike is abused or rung out for all its worth...which seems to be how your bike was originally treated...
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