I'd go with Grand Rock and get the internal mufflers they have for their stack kits. It's a straight through baffle design. I would think they should fit your stacks. It only takes a little edge off the noise as it's still rather loud, but it is a difference. I like them cause I can remove them and put them back in by only loosening the two clamps at each stack. Simple job that takes less than 5 minutes total and they even help with a little fuel economy as advertised.
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