Anyone know how aheader will effect the performance of my 01 650R. I have a e series promeg exhaust, smog block kit, UNI filter, rejetted, air restrictive crap off, and the bike runs great. I would like to know if and in what range would I or could I tell a differance.

Most headers are bigger. This will move the higher in the powerband.

YA,but in what areas will I be able to tell a differance more(lo,mi,top)?

higher in the power band. so top end

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