Not sure on exact use. Previous owner purchased a K20A-R from HMO and I don't think he knew the motor had this LSD. He drove the car roughly 4K miles with a few drag races and sold it. I picked up the car and replaced the LSD. I didn't even know this was a Cusco RS LSD until I did some resarch and contacted Cusco USA. Sorry I can't provide any more useful info.What kind of use and how many miles?
This is the problema with these Diff manufacturers, they want to advertise "more clutch discs, more friction surface area, etc, etc" But they don't tell you that they have to be thinner discs in order to fit inside and then the drive tabs start breaking from the torque.
After reading this article and looking at my broken clutch plates, I think there is an actual benefit to WPC treating the clutch discs. By the way the teeth broke off I would speculate the fracture started near or on the grooves.here's a good in depth article w/pics on LSD tuning: