I saw a link in the sig of someone here (I forgot who they are now) that was to a test of air filters that seemed to show that K&N air filters really kinda suck - that they don't offer any appreciable boost in power and let something like 45X more dirt than standard filter. Is this true? I just recently got a K&N for my Jeep 4.0L I6. What do you think? Should I put the Fram back in? I do tow a camper a few times a year which is the main reason I got it, to squeeze as much power/efficiency out of the engine as I can.