I've got a K&N on my 05 Magnum R/T and I like the sound, not sure of a performance gain,but from what I've read there is a lot of hate for the K&N filter, or any oil based filter for that fact. I've picked up a SRT airbox and tube for it and am going to switch back over to it (has a bigger tube and bigger inlet hole into the box. On my 05 Ram I'm going to make my own using the stock airbox/filter and 4" PVC. One intriguing system for your truck is the Vararam system, guys that use them seem to love them