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I'll really have to search for it, but I remember reading a Product Review website and specifically a business owner that had a fleet of trucks (Silverados, I think) and converted all of them to K&N thinking that he'd be getting better gas mileage and thus less overhead....well, several of his trucks started throwing CELs when they were working perfectly fine before....
Turns out that the "brand-new-out-of-the-box" filters were probably not intended for fleet use I guess because each and every truck had a malfunctioning MAF sensor....he contacted K&N in hopes to get SOMETHING out of them, but they just would not budge and he ended up having to replace X Amount of MAF sensors and went back to paper.....he referred to it as "an expensive lesson learned". This was not the only complaint about the K&N and each story was similar....having to do with oil and poor filtration.
IIRC I actually read this BEFORE the bobistheoilguy tests were even performed (or at least before I had read them). So IF K&N filters no better than paper (which I doubt it does....I'm fairly sure that paper > K&N), and K&N can throw oil all over the place out of the box (although it seems the BIGGER contributor to this is idiots that OVER oil them after cleaning) than why go with K&N at all?
Also, I view AEM dryflow as being a step up from K&N in terms of filtration....the "new school" in reusable filters if you will.....
I've gladly used paper on my CAI over K&N, then problem is that neither K&N OR paper like to get wet....and they both take FOREVER to dry....the only difference is that if a wet K&N has lost its oil after drying, what are you left with? A gauze filtering your intake air....if you have a CAI, you already KNOW what kind of crud gets in down there....now imagine that getting through a filter that you have no idea has even been compromised....no thanks
The AEM was my personal choice because it seems to have been engineered to filter better, give more airflow, SURVIVE complete submergence in liquid, AND it can be easily rung out and cleaned....try wringing out a K&N and see what you are left with.....I did tons of research before deciding which filter to go with, and in the end it always came back to AEM being on top....
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