If you ever plan to get a 34" radiator and 05 efans, be prepared to cut the heat shield on that K&N....I had the one with the plastic tube FWIW, and was very happy with it. I switched to the Volant shortly after my 05 efan install mainly for a cleaner look and a change (had the K&N for a while, was curious if I'd feel any difference with a different system). Both the K&N and Volant w/ ram air seem to perform the same to me, at least on my truck with my fat 33's.