Just bought a 2009 Dodge Ram, Hemi. I found this website and have been reading a lot about oil, oil filters and air filters. I have looked at these topics with a very open mind and not set on any one philosophy. I have my own ways of doing things based on 45 yrs of working on cars, boats, planes and drag cars. But I'm always open to new evidence that another method or product might be better. I will be running this truck till the wheels far off, but I do take very good care of my vehicles and do as much required work on it as I can.
After reading tons of pro/con info regarding air filters, I have enough info (so far) to be convinced that the paper filter is superior to a K&N filter. The cost difference is just not worth the difference in the ability to keep dirt out of the engine. And the only way dirt gets into the engine is through the intake system. My goal is to stop the dirt at the filter.
But if a K&N works for you, go for it.