For your referance. Im running stock fuellines to but im on pump gas only with 740 injectors. I have one 485 pump AND a 255 pump and STILL have my differential pressure drop on me (relation between manifold and fuelpressure). Also run stock fuelfilter which doesnt really help either. I know the problem is there and i have an ecu that compensates for DFP until i bother to fix it so its not going to mess me up tho..