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The reduce is to reduce the 3" to 2.25". Flow is important but so is a quiet ride. henceforth the dual outlet for higher flow, but i need to keep the sound down which is why I'm limiting the outlet size. The question is the chamber itself, I've cut open a 750 muffler and its chamber alot differently than our cars. That why i need to find a good flow muffler that offers the high noise suppression possible.
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MODS:???  
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