I've used the JWT light flywheel on a 07 HR and loved the quick revving aspects of it. But I didn't like the rattle or the difficultly of rev-matching on downshifts (before SRM) Plus the problems of shifting before I knew about Z-Speeds CSC bearing. Plus the RPM doesn't hold well with the lighter flywheel and one must shift faster to hit the rev points on gear changes.
This time around I wanted something more reliable and quieter and with a heavier flywheel to help with up-shifts/downshifting and the 4.08 gears. I went with the Stage 4 clutch offering and a CSC bearing cap. This spring I will be updating to the Z-Speed CSC kit and predict to have a trouble free service life.
Glad to see your a vendor now Joe. Welcome to the forum
