fmf powernow carb insert for yz450f any good???

I seen a fmf power now carb insert on ebay i have never heard anything about theese or how they work. Has anyone tried one if so how do they work and where does it help the most. Thanks

lugger,yes. screamer,no. :cry:

The idea was to make the air flow more laminar at throttle openings up to half. Seems to help the quarter to half throttle response of my 250F, but I can't see why a 450 needs that kind of help.

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