Stay away from K&N oil filters
I just did another oil change on my 2011 328i (I have 50,000 miles on it now and it gets an oil change every 8,000-10,000 miles using Amsoil synthetics) and I always use a BMW filter. However, I didn't have time to go to the dealership and purchase one so I thought I would order one from K&N and install it.
From the start this filter seemed to "starve" the engine at cold startup because you could hear it tap a little more than normal for a few seconds. When I went to change my oil there were TWO big problems:
1. The filter element was very britle
2. The filter element had torn!
No chunks missing but I noticed the filter had a small "caved in" section and when I pressed softly against it I noticed my finger went right through it! This is scary because I have always regarded K&N to have high quality filters.
Thus, to those wondering, I would stay away from K&N and purchase from the dealership to stay safe.