I've got some future upgrades coming that'll require bigger injectors. I have a set of 39# Blue Giants which I believe come out of a Cobra. Will they fit an '06 F-150 5.4 without hassle?

 

yup, direct bolt in as long as you have EV6 wiring, if not a set of adapters is cheap, it's how I run them in my '01 5.4, I'm pretty sure you have EV6 since the 39#ers come stock in the saleen trucks and they have a wider spray for the 3 valve motors

 

Great, thank you.

 

You may have to modify them a little bit. I know normal Cobra injectors need some "shaving" in order to fit.