Nice write up! My Mann filter was back-ordered from Amazon ($19.18 with free Prime shipping, up from ~$15.72 two years ago) but it's scheduled to arrive tomorrow. I ordered two this time.
Based on the amount of leaves and debris that you discovered, I'd suggest spreading newspaper or a large garbage bag on the floor on the passenger side before beginning removal to make clean up a little easier.
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The Coupe: 2016 M4 | Sakhir Orange | Black Full Merino Leather | CF Trim | M-DCT | More | ED 5/13/16
The Sedan: 2018 M3 | San Marino Blue | Black Full Merino Leather | CF Trim | M-DCT | ZCP | ED 7/18/18
The Roadster: 2006 Z4 | Interlagos Blue | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12
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