[mjstef]

Got rid of the factory intake in my Expedition today! The factory intake is over 4" where it goes into the air filter but only 2.25" where it comes through the fender well. I replaced it with a piece of 4" thin wall Sewer pipe, a 4" to 3" adapter and a piece of 3" through the fender well. The Ex seems to breathe a lot easier now and there is no noticeable difference in noise!