Anyone who has taken the entire fuel system apart from tank to vp44 knows the greatest restriction to flow are the POS fittings Dodge used, some of which have ports or openings of just 1/8". If you removed all the stock fittings and replaced them and up sized to 3/8" ID hose it would remove almost all the pressure drop at WOT. This only applies if you are running through one filter. If you are running an after market pump/filter unit into the factory filter it will drop off 3-5psi at WOT. I run 2 filters (10 & 3 micron) because dirt is as big a killer as low flow. The 1/2" fuel line is overkill because no fitting going into the vp44 will give you the equivalent size/volume of flow. The system will only flow as much as the smallest restriction will allow. If you reuse any of the fuel pick-up line from the tank, you are also limited to the stock 5/16" OD stainless steel tubing, which again will only flow so much. If you install a draw straw, replace all the fittings and use 1/2" hose, you are still limited to the opening size for the fitting going into the vp44. If you doubt this, pull that fitting off and take a look. Even replacement fittings used for 1/2" JIC/pushloc still only have an opening of about 1/4" or less because the threaded port into the VP44 is only so big. I'm still on my original VP44 (knock on wood), and rarely add anything to my fuel. Installed a pump/filter unit at 6K miles and have ran the 10 & 3 micron filters and maintained at least 10 psi using the factory 5/16" fuel line from the tank to the pump, then 3/8" hose and new fittings all the way to the VP44. With 20psi at idle, I see a 5 psi drop when I stand on it. This pressure is measured directly at the inlet to the VP, not from the aftermarket pump which is where many people choose to connect their gauges. this doesn't take into account pressure drop throughout the reminder of the system. Hope all this helps and it's just my 2 cents based on personal experience. PS, the 3/8" hose is also a lot easier to work with and route.