Please comment on the Metal Flow kind of Air Filter? (Drop-in type) It is made up of fine stainless steel wire gauze. I think no doubt about the Air Flow but worry about the Dust Filtering capability.
I've wondered about those metal filters myself, although I don't have any experience with them. As long as they had a thin film of oil on the wire mesh, I'd think they would do as good a job as the oiled cotton or foam types......
Maybe OK for Cabin Air (I see e-bay knock-offs), but I wouldn't use one for engine. I've never seen one intended for engine. Do you have any product links? I'd like to see one.