Slightly off topic but I thought you all might be interested. My E90 330 and E84 X1 use the exact same filter. For grins I compared to the M2 filter. See pic below. They are identical in every dimension and way except that the part number is different and the M2 filter is stamped M next to the part number. E90 filter costs $9.80 online. The M2 costs $15 from the same place online.
