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Hi all, nice site. 2003 F350 CC Dually 4x4 Lariat. Stock for now. Had an AFE filter, but went back to stock. I did cut a 3"x4" hole in the grille bracket to allow air to flow directly to the intake. bumped my MPG by 1mpg. now getting 15.5avg/18hwy with light foot. Although I've had some issues(truck has an new 04 motor and new turbo) I love the PSD, it has done everything I've asked of it.
I do have a question not sure if this is the right section to ask.
I am looking to improve MPG. Warranty is over so now I'm thinking tuner(GMS?) and exhaust.
the Mech at the dealership says go with a cat back 4inch. He says the 6.0 needs a certain amount of back pressure to function correctly. Any thoughts? I get mixed suggestions from don't touch, to straight back, no cat, no muffler. very confusing and this is my first diesel.