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2000 xr650r

Free flowing header VS stock header on xr650r

3 posts in this topic

I own a uncorked and street legal xr650r. It has the stock header with a fmf powercore IV muffler. Does anyone have any experience with a free flowing header like fmf VS their stock header? Will my top end increase be huge? Will there be a big decrease in low end or mid range power? I ride 50% road and 50% Open feilds with some hills and canyons. Thank you.

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It will get you very little power increase at low mid and top, the muffler does the trick, not the header, it only makes the bike look cooler!! :applause:

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