I was going to suggest using a K&N, as I have used them on all of my Chevy's, but I just don't feel like they are really necessary, unless you really drive a ton of miles per year. An OEM paper filter should be good for about 10-15k miles if you don't live in an overly dusty environment, and you can have issues with over-oiling the K&N and the MAF sensor on these trucks. My dad was a truck driver for years, and he said they used to just take the filters out, beat them on the side of the gas tank, then use compressed air to blow them out from the backside. He would do this 2 or 3 times before replacing the filter. I always thought that was kind of screwy, but he drove with guys that had almost a million miles on their trucks, and he had well over 250k on his Peterbilt when he sold it.