(1) Has anyone ever removed the fleece sock, sleeve or whatever you call it when installing an air filter on an A8 or S8 (D4)?
(2) It doesn't look it'll do much other than add to the flow resistance of the air filter given that the paper element underneath is perfectly fine for just about every other application.
(3) Has anyone ever removed the fleece covering and simply run these filters with the bare paper element?
(4) Anyone ever got TD1 because their filter does not have the fleece cover?