I had a ‘15 Laramie ED. This generation of ED only ran great with a tune or delete. Unfortunately, the EPA has cracked down hard on the aftermarket tuners and are surveilling most of them constantly. They can no longer sell tunes that compromise federal regulations. This happened around 2019. The Green Diesel Engineering (GDE) engine and trans tunes I had were pre-2019 (non-compliant) and did a great job of waking that truck up. It pulled my boat and trailer better than my ‘19 Hemi does at 22-23mpg. However, like
@Ryan Avery observed, the crank position sensor-tone rings, turbo line leaks, and engine compartment fires are real risks and very costly. The turbo line is located under the intake manifold and made from very thin material that is subject to premature failure due to excessive heat sink.
IF you decide to go this route (I wouldn’t) the first thing you want to do is remove all the slow death foam and the insulated plastic cover from the top of the motor. These hold a ton of heat on sensitive electronic connections and cause failures. Next remove the heavy insulated steel cover from the fuel pump near the EGR. This is also known to cause failures.
Finally (and only because it’s easier with all that crap gone) remove the EGR tube from the intake and see how bad the coke/soot build-up is. If the truck was never tuned I guarantee the top end will be horrible. Mine was bad at 35k miles, and fortunately I knew an insider that told me how to get the intake replaced. If it is full of that greasy tar and baked on coke, you’ll want to replace the intake to prevent hard chunks falling into the motor and destroying it.
Lastly, I’d find a full delete kit and tune for it.