i havent really looked into polaris exhaust that much, but i do know that you can remove the fill inside the stock pipes / silencer. most of the time they are packed with fiber glass type sheets, or a gauze material. since i work at a tool and die shop, i chopped my silencer in half, took all the crap out of the inside and rewelded it back together. that gave me some horse gain because of the exhaust flow increase, not to mention it sounds badass now lol. sorry i couldnt be more help
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