2011 5.4.
Eiter brand. $70
Cheapest I could find. Use it for my road's hill near me and highway driving, especially 2 lane roads where I need instant response to pass.
I got tired of the stock "up to 6 second delay" that Ford built in.
In a parking lot I turn it off. Normally I run it at one of the lowest settings, 1.6.
Setting 3.9, the highest, just about full throttle when touching the pedal, wow.
I'm guessing a more expensive one might be more stable as it can surge, but it's perfect for what I need it for.