What sort of goals do you have? More Power? Better towing gears?
The days of the full delete packages and shops that did that work is pretty much a thing of the past. My 2017 got the full treatment and it was a real beast when the tuner, custom tune, intake & exhaust work was done.
However, firms like Diesel Power Products have developed performance options such as tuners, intakes, exhaust, etc... kits that can be installed and still be legal from an emissions standpoint.
So check them out along with Banks, Motor Ops, & PPEI. Also, take a look at DieselIQ.com for some good info on what can be done within the stock OEM package.
Good luck with your mods.