okkkkkkkkkkkkkkkkkkkkkkk? are u referring to the fuel pressure regulator?
but regarding getting a afpr because u got a walbro still makes no sense… Getting one because u need to dump more fuel into the engine out of a limited duty cycle, its more accurate/reliable or it improves vaporization/spray pattern all of which i can believe.
never mind i think i just realized what ur doing.
For one im not familiar with ECU tunes as i don’t know what control that gives u. Timing, Duty cycle? factory map/tables?. But im assuming because of limiting factors of the ecu your tuning your fuel injector flow mainly by pressure and not duty cycle?