I have read that the ECU will compensate for any modest changes in fuel pressure. That being said, my stock regulator has the FP at 42ish with the vacuum off. If I were to back it off to 38 or so with the vacuum off, would I get any results? I have an AFPR waiting in the wings, but if there is really no need to lower the FP, then Ill just wait on the install. Any advice?