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800's=120HP 60HP per cylinder, 1200's=155HP 51.6HP per cylinder. Built a XLT1200 w/ replated 800 cylinders the other day ,many other improvements as well, but WOW what a difference ,I don't know how much power it makes as it was not dyno tested but it is much better than other 1200's we have done with the same improvements but original type cylinders. ONE MEAN XLT!! FX H.O.'s SEEE ya!!!!!!!! You GP1200R guys might want to look at this too.