Screamin' Eagle® Performance Clutch Kit #37969-03A Screamin' Eagle® Twin Cam Performance Race Clutch Hub Kit #37976-08 Screamin' Eagle® Big Twin Compensator #40274-08 what would replacing stock parts with these listed above do for my '09 RKC? would the difference be noticeable? would it extend the life of the clutch? or is this more for folks into "performance" machines? and, to tell the truth, i don't know the difference between a clutch kit and a clutch hub kit. can someone explain these upgrades to me? i have read glider's post about the compensator upgrade. i have money from the sale of my last bike that i want to use wisely on my RKC. is this a worthy investment or a waste?