I have read that the twin Hitachi SU carbs in our cars can only handle 4 PSI from the electric fuel pumps. My mechanic recommends swapping my electric fuel pump with a Facet Silver Top and regulator:   https://www.pegasusautoracing.com/productdetails.asp?RecID=85   I am really aiming at a noiseless or very silent fuel pump that will keep on pumping gas even when decelerating at corners.Is the above fuel pump recommended for a 240z?