Does anyone know the best HP and ft/lb gains recieved by any given supercharger. I am just curious to see how much my little f150 project might run me in the end. And why buy something if it isn't the best, and most safe option.

If you want to buy one,get one made by Jack Roush.The advantage is the warrenty is still good if there is any on the vehicle.and is the only one approved by Ford

Yeah I agree, there isn't much better than the name roush when it comes to ford.