yeah polaris does a damn good job with their stuff. In that case, id say just screw it and go for sound haha. I know my quad the header pipe cannot be improved with aftermarket, but slip on i can gain 5 hp. 10-15 if i do airbox mod, with K&N and jetting of course.
but for your rzr, if the gains are small like that just get what sounds good. I do like the sound of the muzzy from what i can get on youtube. or barkers sound really good on the 800, cant find a good video of barkers on a 900
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