looks like the f5's are down about 10 hp from advertised this is info I got from a big ac shop ( can't get any to dyno) and the dyno runs at the shoot out also show poor power. How is eveyones f5 running? The story I got was the cylinders are not up to par compared to the protos. The 440 sno pro's seem good but the f5 seems to be sick this year. The early racing has very little f5 news. I tend to believe the ac shop that told me this. This sucks as I just traded a 2002 zr500cc that ran strong and it looks like the f5 will fall short.