Hi Docbar85. I presume you have quarter horses? Anyway I did buy the maxflow for the stihl 046. The filtration has been good but I don't know if it's worth 40 bucks. I didn't notice any drastic power gains honestly. The stock stihl HD air probably flows enough air to begin with so I don't know if the max flow is a real improvement. Not sure on what saw you have but if the air filter is the flat kind, then you would do better to upgarde to the HD style or maxflow. But if your saw already has the HD style filter, I would just open up the muffler, tune the carb and pull some chips.
Hope this helps. Fellow quarter horse man and chainsaw nerd,
Lucky