We have 2 ZX10R's for next race season so far. Got lots of info on them. Stock on my dyno put out 164hp. Made a Hindle race pipe work as a slip-on muffler with the stock titanium header and picked up 4hp at the 11,000. Picked up 8 hp in the mid range and 6 up top. The HP does drop off after 11,500 due to them having to close the sub throttles back at that point to meet the EPA rules. I fixed them to be wide open all the time and the bike is now putting out 180 on my dyno. But at the same point at 180 the bike now has and easy 20 more hp. Really liking this bike and can't wait to get it finished and ready to race this season.