well technically you do have a "filter" at the bottom of the pump in the tank.
The port on the regulator in theory should have a vacuum reference behind the throttle body, when at idle it will pull vacuum and actually lower the fuel pressure a few PSI to help with being rich at idle, then when cruising and there being minimal to no vacuum it will go to normal fuel pressure and then when under boost it will increase 1:1 fuel pressure to boost PSI. at least that is how the ones on the turbo car's I have dealt with in the past have worked. some regulators have a different ratio than the 1:1 but 1:1 is standard unless you go all import and find a 12:1 ratio one.
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