Riding the grades in Hatfield McCoy, the EBS in my Northstar factory clutch wanted to make the ass end come around beside me on steep grades when it kicked in. I first eliminated the 1-way bearing, then still had some hard shifting with the factory clutch. I finally installed the Gilomen clutch and that resolved all the issues. It's been much better on steep grades. Last winter I installed the GGB exhaust. I didn't do that hoping for more HP. I already had 118HP with the Gilomen tune. I did it for the smaller and higher mounted muffler to make it easier draining the fluid. The factory muffler was in the way and a pain. Our next trip to WV, I found the reduced back pressure made it even smoother going down a steep grade.
Anyway, I think Polaris is using a clutch on these w/o the EBS, if I recall correctly. I think I read that somewhere.