Out of curiosity (and because I'm a data whore) I went and did a couple of pulls to compare a drop-in filter (I have the Cobb) against OEM. Not surprisingly (FI application), there doesn't show to be any discernible difference. I'm currently trying to find someone local-ish that has either the Mountune intake or one that is modded similarly to test as well. The odd numbered logs were headed North while the even numbers were headed South. Everything was done within the span of 10-15 minutes.
http://www.datazap.me/u/dyn085/filter-test?log=0&data=9
http://www.datazap.me/u/dyn085/filter-test-0?log=0&data=9
http://www.datazap.me/u/dyn085/filter-test?log=0&data=9
http://www.datazap.me/u/dyn085/filter-test-0?log=0&data=9