quote:

ORIGINAL: jalapeenoz

OK, I know I am going to be in the minority here, but based on the various setups I have tried on my D as well as previously on my Ram I am now convinced that the stock set up (at least on the 4.7) with a good flowing filter is the best way to go.  It draws air in from a cold source and flows plenty of air to feed the engine.  My Fastman actually works better now with the stock intake back on rather than with an Air Raid type set up (which is similar to the True Flow intake system that so many people are buying now).  The K and N type intakes and the cheapy Ebay ones draw in more warm air than the stock set up and are prone to heat soak.  I know there will be plenty of you who will swear up and down that your aftermarket "CAI" made a dramatic improvement, but I am saying that based on my own experience that the stock set up works just fine for normally aspirated/mildly modified engines. I have discussed this with a couple of mechanics (with a combined 50 plus years of experience) and they have told me basically the same thing.  I believe there are some tests out there showing little to no gain from aftermarket CAI's compared to the stock intake.  Just my 2 cents

quote:

ORIGINAL: jalapeenoz

Yes I meant K and N CAI ( and similar intakes that have a tube and an open filter hanging over the engine compartment).  As I said this is my own experience that I have had on a couple of different vehicles.  Not only did I not notice an improvement with aftermarket set ups, in some cases I actually felt a decrease in performance.  I believe Hank has some links to some actual dyno tests that prove the same thing.  IMHO you could put the couple hundred bucks toward something else that would give you more significant gains.