for anyone who is thinking about getting a cold air intake for their V6 f150, i have a few videos for sound comparison. i do not have videos of stock but i have videos of the same intake on my 04 heritage(03 style) i had and my 08 i have now. it is a K&N 77 series made for a 04 f150 heritage 4.2L. the 04 was a reg cab longbed 2wd 5speed 4.2L here is the videos of it..
04 heritage...at about 3/4 throttle.
http://www.youtube.com/watch?v=-4b3SyQYWuo

at WOT with very bad clutch slippage at beginning from 95 degree weather...
http://www.youtube.com/watch?v=K5vGBlO5DOI

vs the 08 reg cab shortbed 2wd 4.2L 5 speed with same intake..
http://www.youtube.com/watch?v=jTreqZ9FEFU
and from outside...the ram is a V8 so you can tell which sound is from my truck...
http://www.youtube.com/watch?v=uaRrB4dFo2Q

which one sounds better? i vote 08
according to my state registrations, 04 was 3897Lbs and 08 is 4364Lbs. 04 had 3.08 rear end, 08 has 3.55s. if you notcie the 08 is quicker even tho it weighs 467Lbs more. i have never got either one weighed tho.