Here's an interesting bit of information. Apparently the OEM filter the cars are built with in Japan (black filter, 15208AA160) are not the same as the ones available in the USA (blue filter, 15208AA15A), and many people believe the black filters are better. Subaru doesn't sell the black ones here, but someone figured out that Mazda does, under the part number N3R1-14-302. They say it is exactly the same filter in every particular except that it says Mazda instead of Subaru on it. I don't have personal experience with it but a lot of people seem to be having good results. Take it for what it's worth to you.