I just had a 103 kit installed on my 2007 RK. i already had the rinehart tru duals and the se high flo air cleaner and had purchased a se race tuner so the upgrade kit including new cylinders, pistons and a set of se 255 cams heavy duty clutch spring and various gaskets cost me 1,570 bucks including labor and 2 hrs on the dyno. Well let me tell you the bike runs and sounds great. the numbers on the dyno were after a baseline of 67 hp and 72 ft/lbs of tourque after the install and being dialed in on the dyno the numbers jumped to 95 hp and 97 ft/lbs of tourque. Like i said the difference of 7 ci was unbeleivable. The pulling power off the line was amazing and the torque throughout the powerband was incredible. I would highly recommend this upgrade and the best part is that the hd dealer that installed it does not void your warranty.