If you are going to keep your Tuners, depending upon your budget for carbides, Snow Trackers makes carbides for the Tuners. I really do not like anything about the Tuner skis, and have replaced them on all my sleds except the most recent one, a Sidewinder LTX. Because I had a big trip coming up at the time I bought the sled, I did not have time to swap out the Tuners, so I took a chance on the Snow Trackers. That was over 5,000 miles ago, and the Tracker/Tuner skis are still on my sled. If you are a trail rider, forget all the expensive aftermarket skis with all the bells and whistles to stop push and prevent darting, etc. The Tracker/Tuner combo is easy to steer, with no darting, and they have little or no push under most conditions. The 5,000+ miles I have on my Sidewinder have been the most enjoyable miles I have ever had on a snowmobile, and I don't want to change a thing.