I've posted a lot about that. search the archives here and at bimmer.org. don't waste your money.
I took a look at the way the filter fits into the box. the foam layer seems to be more for noise cancelation than filtration. air can easily be drawn into the sides of the pleats thus circumventing any added filtration properties of the foam layer.chan said:BMW stock filter for the E46 has two versions. A full paper type and a 2-stage paper & foam filter.
Any difference in performance?