How did the Predator work for you...my goals are a bit more towing power on 91 octane and to get firmer and more effecient shifting (up and down) on hilly country..if I get better mileage thats great too...i'm driving a 04 f350 4x4 crew with a 5.4L 2valve with 3.73s and already have a gibson exhaust and K&N replacement air filter