I'd think an oiled k&n and an outerwears would suffice? Idk. Never used k&n. I bought a cheapie uni style off eBay for $6. Oiled it and milled with it a couple hours and no fines got through
I'll have to compare it to stock, hd2, and a 6"*4" oiled uni. With all that surface area I thought it should be very unrestricted, maybe the fine foam first layer is too much???
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