I have a 4.6L f-150 with a 5 speed and 30,000 miles. I have been looking for superchargers for my truck and i havent made it too far, i dont know what to get. I really like the kenne bells, but do they even make them any more!? I would definitely like a twin-screw/roots style, but i have no clue on what one to get. I have 4-5000 to spend.