[Remmy700P]

As many different opinions as there are truck owners. Me, personally, the stock intake is a true cold air intake. Having said that, it does have a few restrictions.

http://www.tundrasolutions.com/foru...ystems/109612-stock-air-flow-numbers-and-mod/

I designed my own ram air intake which has helped a little on acceleration as well as fuel economy.

http://www.tundrasolutions.com/forums/forced-induction-systems/173400-ram-air-intake-scoop/

I am running a True Flow drop in foam filter and find that it does filter better. I had a K&N for 16,000 miles and just from the condition of the filter when I took it out (it was as clean as it was when it went in) felt that it did not filter very well. The True Flow was absolutely filthy when I cleaned it after 4,000 miles.

http://www.tundrasolutions.com/forums/1322872-post31/

There is a ton of stuff here on the Forum about cold air intakes but my opinion is, strictly on CAI that the stock set-up is a true CAI - just has some limitations. Best filter is stock or a foam filter - K&N does not filter as well but does flow like living hell.

To the OP: I'd listen to this guy... he's done more exploration on airflow on the 4.7L than anyone I've seen. He knows from whence he speaks! :tu:

 

[Remmy700P]

I'd stay away from K&n, there is sum threads that say how they can mess up your truck.

And how do they do that exactly? Or are you just passing on some heresay?