I've been using K&N for a very long time. Whatever dust that gets through it, burns up during the combustion. So I get freer flowing and more HP. Never had any engines go wrong. Believe me when I say this, no dust is going to survive the extreme heat inside those cylinders. I'm a performance enthusiast all the way and put all my years of experience into trusting K&N all the way. I clean my filters every 10K miles because it is very easy to do.