I have a 2012 2.0 A/T and a few months ago I installed a drop in K&N filter. The first few weeks with it I noticed only minimal gains in throttle response and MPG. Recently though, I have been able to hear my BPV/BOV very prominently, especially in 3rd and 4th gear no matter if I am in full auto or tiptronic/autostick. I did not remove the silencer or do any other MODs yet other than the K&N. Any ideas on why I can all of the sudden hear my stock BPV/BOV? The car hasn't seemed to lose any power and still runs smooth so I don't think there is a boost leak.