Has anyone tried one of the many fuel management units for the 850 with or without a pipe? I'm about to put a pipe on my sportsman 850 and figured I might as well fine tune the fuel mixture while I was at it. The optimizer HMF offers looks a lot like Wisecos unit. Any thoughts on this?

 

I hope you get a pipe and the fuel management and post your results. I think a air/fuel ratio gauge would be needed to really tune it.