Unless you already have a SAFC, your gonna have to get a pretuned ecu like from entahlpy or jwt and if you want to have it tuned at a dyno youre gonna have to fork up even more cash and get a safc and tune the ecu with that...sucks i know
enthalpy
that's the beauty of a rom tune, you don't need to know anything but the parts you're installing, the tuner takes care of the rest.
Yes rom tunes are great and you dont need to retune if you change your boost level BUT if your tune isnt on point and you want it fine tuned you are basically fucked unless you get a safc and fine tune the ECUs base tune with it.