I have installed a few Dynojet kits that came with K&N Filter and Outerwears cover for heavy dust like that Nasty Coal dust I did 2 Yam YFZ's and other than you have to tune by trial and error not what the sheet says There nice kits You can see what PA coal dust does after a 3 hour ride ......

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what part of PA u in bad bear? im in northeast PA. right outside of forest city... did a 50 mile jot on the railroad bed yesterday... still tryin to get the coal outta my eyes. [:@]