i have 2004 and it has 4.6 is the S&B Cold Air Intake good far 200.00 bucks.and if i put true dules and no cats will that hilp mpgand jegs has the eage far 349.00 is that a good price are shold get a nother kind .

 

If you want the best air flow without drawing in hot air from the engine bay.
do this & WAY cheaper and will out perform any CAI...save the$200 https://www.f150online.com/forums/ar...4l-engine.html

going without cats will probably trigger CEL & eventually runability issues...but going Long tube headers and high flow cats & muffler and full dual pipes with and good tuner that takes into account for the mods...now you'll generate some power where you'll feel it in the butt dyno

 

There is no worthwhile mod for improving fuel economy. Maintain your truck keep the tires full of air and keep your foot out of it. If you want gas mileage buy a Prius.