ful system

[greyyfz450]

i have a slip-on hmf i just bought and i was wondering if i should get a head pipe and if i do would i notice a differance and would i have to rejet plz tell me i need to know fast thx

[Pack]

I don't know a WHOLE lot about them, but I do know that a stock YFZ's head pipe is plenty enough. I just got a slip-on on my '07. And it makes me happy.

Plus, either way, it's always good to rejet it. I haven't, but I need to. Hope this helps.

[TWISTED DINLI]

when we put a hmf full system on my bro's yfz it made a HUGE difference in power. And yes you have to rejet it.