I seen a pic of them and really can't see how they would make much of a difference. But what do I know. Last season I tightened my limiter strap one hole and I think it made a difference, cause when I jumped back on my 04 rev that buddy bought from me I could still climb higher, sure it was a 159 vs 154 but 2 inch to 2.5 and more power. Don't get me wrong I think the xm is the easiest riding and most fun sled ever just wont climb where the rev would????
They look like just something to break off and chew up your track. Save the $80 and use it for 2 tanks of gas of riding. And there is more to riding then just climbing!