filters
I have actually researched this a lot, and the best writeup I have found basically said the K&N flows better(negligibly) but lets in more contaminents(also negligibly). Basically what it has come down to for me is cost vs convenience and since I dont like cleaning and oiling filters I stick with stock. Unless you complement the filter with top end and exhaust upgrades you more than likely wont see(feel) any performance enhancements, also unless you keep the truck for 30 years I doubt the extra contaminants it lets in will affect anything either...my two cents

