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I have a 1987 Ski-Doo Safari 377E. I was wondering if taakind all the stuffing inside the muffler out. I dont know if it woul improve it. I dont know if it will hurt anyhting else on my sled either.
 

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doing that sometimes will affect the performance of the sled, good or bad, but not always. it will make it louder though. -Polaris Doc
 

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Most likely you'll soee a slight decrease in residual back pressure, not particularly good on two-strokes, but all you'll see is a performance decrease. But at most 1-2 HP.
 
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