Originally Posted by BMRLVR
Have to agree with you on this. I had a BMC filter in my car and removed it only to notice little difference. I personally think that there is no performance to be had on the 2010 and up M3's by putting in a performance filter. Also a Paper filter is going to filter better than a cotton and gauze filter of the same filter area. I have posted on this topic in great detail before. To keep it short and sweet, "you can't let more air in with out letting more dirt in unless you increase filter area".
With the above being said, there is some power to be had by butting a filter in an 08/09 car that came with the charcoal element integrated with the filter. Personally, I think someone should make a solution to allow the new 2010+ filter in the 08/09 car without having to change the entire air box.
Our filter drops in all years of E9x m3's.