First thing I’d do is order the ecu flash tool cable off eBay, and try to find a way to get the thermostat temp up about 20° more.
The tune will disable your EGR, and you can physically remove it or not as you like.
Disconnect the fuel heater connector, pull the coolant heater relay.
You can tune in a lot more power but you’ll need to bulletproof the ****** if you do so.
Gut the cat, disconnect the PCV, install an EGT gauge, in-tank lift pump,
That’s the short list lol.