Replacing your carbide runners on your snowmobile is important for safety and performance. I installed a set of Woody's 8" carbide runners on my 1996 MXZ 670 as the current ones were severely worn and one broke.
The performance increase was incredible! Turning on ice and pavement was like it was on rails. Running on hard packed snow with other ski ruts reduced darting. Overall this was a great $100 spent to bring an older sled back to life.