Hey fellow 7.3 PSD friends! This is my first post-not sure what I'm doing or the proper process to reach everyone--here goes. I have a 2001 F-350 PSD 7.3L ,Automatic,3.73 gears and pull a 37 ft (approx 14K lbs) 2006 Designer Fver ,and would like to know what power and mileage mods can be made at...