I have a 03, 4.7. I'd like to add some HP to help pull a 6x12 box trailer. Weight is fine, but at high speeds (55+) wind resistance becomes an issue. RWHP is around 175, RWTorque is 235, which is pretty good for our trucks, but I think another 80-100hp would help the towing issue. Does anyone make one? Can't seem to find any good articles on it.