I recently posted a US air filter replacement DYI. See
http://www.e90post.com/forums/showthread.php?t=4101.
I did not pay any attention to the inside of the rear air cleaner housing until I saw this thread. In several of the photos in my post, the charcoal filter can be seen. I may have to redo and remove the charcoal filter.
Thanks
Wallyf :rocks: