I don't know that the Fox are the upgrade they used to be over some others anymore. I think the fully adjustable stock shocks are all about equal when it comes to performance. When you start to gain an edge is when you start getting into the higher end shocks like the more advanced models from Fox and Elka. Yamaha may be making this move just for brand recognition to help get the Wolverine out there. With most of the other competitors running Fox, the lesser informed buyers may be inclined to go with one of those models based off the recognition of the shock brand name.