ajmorell wrote:That's a supercharger, not a turbo. What engine in your F150, 4.6 or 5.4? Do some reading to see how the engines are holding up to boost in stock form.
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x2. that is NOT a turbo kit (good luck finding a decent turbo "kit", most good turbo set ups on gas motors are custom) but a supercharger is a great option if you wish to throw down the cash. I've got one on my truck (silverado 2500 /w 6.0L gas motor) and I can hold pretty steep hills on the highway and never down shift, and maintain my speed with minimal throttle input. but I can tell you a supercharger really helps the most when the Rpm's are higher (anything 2200) and you can start to feel it pull.
but If you're looking to gain back some power after bigger tires (as suggested you might be running) I would look into regearing your differentials to restore your rpm range back to factory and take the strain off of your transmission instead of adding to it with the supercharger.
I have 37x13.5 tires a ran my factory 4.10 gears for a bit with the supercharger and the truck was still a sluggish dog unless it was wide open turning 3500+RPM. Now that I regeared to 4.88's the truck is pretty snappy through out the RPM range and it feels much stronger now. it also used to downshift a lot on the highway before the regear. I would rather have the mechanical advantage of gears rather than throwing more power and stress through my transmission to turn bigger tires if this is the case.