Its a nice filter and I have no complaints about it but I could scarcely hear a difference and didn't notice the slightest difference in performance. I expected the latter, the stock box/breathing/filter is quite a robust system and there just isn't any low hanging fruit to be had there. The barely noticeable difference in sound I wasn't expecting. From reports here I was looking forward to a respectable increase in induction sound but that was not the case. It was just so as you can notice.
2012 E92 Space Grey with fox red/black/black, comp, premium, DCT, premium sound, sirius, heated seats.