I have a 4.6 with a 6 speed auto on my 2010 xlt. I put on 33s and leveled it and now I want some more power. Anyone done any power mods to the 4.6?

 

I just got an underdrive pulley from summit racing. Don't know when I'll have the time to put it on, but that's gonna be my first mod for power.

 

get a programmer, it's the best bang per buck. You're not going to make a ton more power but changing the tranny shift strategy let you get the most out of what you have. It also allows you to correct the pcm for your tire size.

tons of info here
https://www.f150online.com/forums/ch...rogramming-34/