Do we have any Powerstroke nerds in the house?
I have an '01 F550 with 398K that needs some love. Slated to get 8 injectors, glow plugs, injector cups, under valve cover wiring harness (#4 is fried), and up pipes in the very near future. Throwing codes for #4 injector harness and low pressure to the turbo. There is a definite exhaust leak under the hood which would make sense.
What are some other things to do while I'm in there to free up a little power and make it more reliable?