Took about 15 minutes in total. Hardest part was being a contortionist behind the gloveboix and then finding attachments for the vacuum cleaner to get at all the dirt and leaves in there. Big difference in blowing power as well. The old filter was 2 years old and black as hell. This will become a yearly ritual for me now that I have it down pat.
Used this as a guide and it helped a lot:
http://forums.bimmerforums.com/forum...aq+microfilter