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Hmf muffler repacking

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So this is the first time im repacking the muffler on my yfz and there's actually 2 perforated tubes. The normal core going though the whole body of the muffler and there's a larger diameter but a little less than half the length of the core. The smaller perforated tube is just dangling thru the muffler and not welded to anything. I don't see a purpose for this and don't know why its there. I checked on the hmf website and they don't show it in they muffler repacking. Anyone know what its for? If not im just going to cut it off



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