"the headers for the 5.4 3 valve motor are the same as the 4.6 three valve motor, i have a 2005 f-150 stepside extended cab 5.4 three valve i added a k&n cold air intake arrid throttle body spacer cut the stock exhaust off put a X pipe two…"
"from what ive read on online threads most people say the new 5.0 ford allready has a factory kind of cold air intake and to not change it. i am lookin into american thunder super 40s and a banks iq tuner and maybe on of those throttle body spacers.…"
"First, a low restriction intake like a K&N. Then a programmer. I bought a Hypertech when they were on sale for about $275. Next, maybe a throttle body spacer and then a set of headers and exhaust system. Those items should give you the most bang…"