Just got me a PowerNow. Will be installing it this weekend. Talked to P-N folks and they said the CRF250 had the best improvements of any bike they have tested. Dyno results show a 2.1 h.p. increase at 1/4 throttle. Thats huge!! I'll post results as soon as I getter dialed. Also they left the jetting stock with stock filter and just had to adjust fuel screw only. 2.5 turns out was where they ended up.