Originally Posted by crunchy_frog
I checked with ATP and the filters CF233 and RA82 are sold INDIVIDUALLY. so since our car needs 4 filters, we're back to over $100 for a complete set.
Check out the E90 post links i posted, a few guys say the "Mann" brand are also the same BMW OEM lines
IMO, if your original filter is dirty enough, changing it to the standard E9X filters (if it'll fit, and assuming it's of lower quality than the M3 filters) will probably be better than using a dirty filter.