after seeing some data that showed that the air flow through the air filter is not the weak link in flow I now stick with stock. Overall stock filters better per most testing. So my thinking is flow is not an issue and better filtering is good.
I have also seen some poorly maintained or cleaned and oiled K&N's. Too much filter oil and a MAF is not a good combination. A dry or compressed air blasted K&N filter is not good ether. K&N's are a thin layer of fiber between 2 layers of corrugated shape screen. Compressed air can knock the fibers around and leave holes for dirty air to go through. This tends to show up in the peaks of the screen ribbing. I distorted one by over tightening the cap nut and noted that the fibers ended up moving out of place after a while. after cleaning and drying but before oiling i hold them up to a bright light and look through them for starlight holes.
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http://vimeo.com/29896988
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