To Cyclestuff: The quick version: Busa: best drag bike, top end bike, and has the most potential for more hp. ............. ..R-1 best "twistie" bike. I have a 2000 GSXR 750 coming in 2 to 4 weeks, that may take that title......................... ..ZX-12 : good "twistie" big displacement bike, fills the gap between R-1 and Busa. More comfortable than either, on the long haul, more upright riding position. Smoother on vibration . Does not have that irritating buzz, in the 4000 to 5000 range, that Busa has. Only mods planned would be -1 on front sprocket, and +2 on rear, to get use of 4 th gear in quarter. Clutch easier to use in launch, but is offset by bike having taller 1 st, 2 nd , and 3rd gears. 6 th gear lower than Busa. Actual, measured speed at 5500 rpm is 93 mph ( 100 mph on speedo ) . Projected top speed @ 11,000 rpm is 186 mph. Peak hp reported on a dyno, from another source was @ 9800 rpm, with stock pipe. Peak hp / rpm may be 10.5 to 11k rpm, with Muzzy. Was practicig 60' times, and cheking speedo at local dragstrip, last Saturday. Will do full 1/4 mi. pure stock, and with pipe and gearing, next month, when I have more miles on it.