You should hear me when I give my opinion of K&N air filters.
There's a reason why EVERY one of them on the K&N end cap has dust on it. I refuse to lie about them. I will sell one if a customer just HAS to have one, but I will not stand there and tell them something that isn't true. Ain't happenin.
Now, I don't say they are junk......just that if you're not the type to really stay on top of cleaning and oiling them, they do no better than a good quality paper filter. And that's the truth.