i dont reccommend it. at all. especially if its an 05 or newer three valve.


sure, it may run a wee bit better, but i doubt the fuel economy will improve. the 5.4 is stout enough as it is, if you need more to pull a trailer, you need a diesel.

i would take the money he would spend on a programmer, and set it aside for a timesert repair that will probly be needed when a spark plug blows out of the head, they are notorious for it. we do many.