I use the older turbo slider (not the tiwn) on one of my buggy motors. I like a late clutch. When the shoes are new I use 3 hard springs. As the shoes get smaller the clutch starts to enguage later. When I notice this, I replace one of the hard springs with a soft one & continue that until the shoes are gone. The shoes last a very long time & cb bearings seem to last a little longer on this clutch as well. I have also used the RMV speed II. It's shoes last a long time also.