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I have an 2000 mxz 700 that has a stock pipe and a silencer on it, all of the insulation is gone from inside the silencer.my question is,is that going to limit my hp from the pipe? (NO BACK PRESSURE NO POWER?)
 

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Good question.  I have always wondered that.  Alot of people are taking their stock silencers apart and installing a solid piece of pipe instead of the stock pipe with all the holes in it (while leaving the expansion chamber in tact).   It gives the sled a much better sound.  I wonder if you will lose performance doing this.  Anyone know?
 
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