Has anybody added a fuel pressure regulator to the engine? I am not referring to the the stanadard FPRs that come on certain blocks but the aftermarket versions that allow you to up (or lower if necessary) the fuel pressure to your injectors if needed. One has come my way to test that is meant for a celica but a tiniternet search shows it to be generic..

I am curious as to the benefits of this and whether it is more gimmicky than functional. Surely the map on the ecu will have the correct amount of control over this....