Hi there!
i just wanted to give you my opinion about K N filtering.
i've installed one into my airbox for about a year and a half now, and i've noticed a positive change.
little increase of "breathing fresh air"
noise slightly changed, hard to notice for unexperienced ears, but if you pay close attention, especially on engine 2.0 liters or more, you can hear it
the KN air filter is still clean after 17/18 months of driving, so approximately 20.000 kilometers, no cleaning needed yet and of course, no need to replace it buying a paper model.
about the filtration: no worries mate! really no need to worry since the filtration is at least as good as OEM models, thanks to their very specific material/design + specific oil.
if you don't trust me about filtration being AT LEAST as good as with OEM models, you should go have a look at their web site, they have very good explanations and tests showing the difference very clearly etc... etc...
so no problem at all with oil , if you dont get it too greasy
and no problem at all with filtration, since i'm trying it myself + other people's experience driving 300.000 km with it or more..... + KN laboratory tests very well done and explicit.
i hope this will help some people make the right choice, and some others change their mind about KN filters. lol i'm not working for them, i just really appreciate the difference.
thanks for reading!