Yep +++10000 ^^^^. The very last air filter I would use for any engine is a K&N. The only way to get more flow in a given filter size is to reduce filtering(aka..bigger micron passages through the fabric). The oil that is used is what they use to "filter" the air, it works ok to an extent but not as good as a solid cloth type pleated filter(plus an oil layer?). I'll stick with actual physical filtering. I also use Outerwares filter skins over my filter in dusty conditions. When running/playing in sand dunes I have also run a couple rings of grease(the stickiest I can find) around the inside of the intake runners, after the filter and before the carb, to catch that last little bit that may get through, just have to make sure it doesn't run and go into the carb passages, the sticky stuff works for this
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