The Kimpex Stealth ski is the worst pile of garbage ever made for a snowmobile. DO NOT buy them or run them on your Nytro. They are extremely heavy, they don't turn at all in any kind of loose snow, and those stupid skate blades underneath catch #*$&@ under the snow that you had no idea is even there. I caught a root or a rock under a trail and bent an a arm and the subframe on my old Nytro. I felt bad and didnt want to sell the skis to some suck, so I threw them out.
The split rails are the best handing ski IMO, like power steering and zero darting or push. The only issue is the proprietary fasteners used on the split rails. If you ever lose a piece or something happens to a ski while on a trip, your ride could be ruined instead of being able to get another bolt at a hardware store or even bolting another ski to the spindle.