P2M version 2.5 adjustable fuel pressure regulator is one step beyond the normal unit we carry. The large FPR was designed with a larger casing body to sustain a larger volume of fuel, can withstand the heavy duty abuse from high fuel flow use normally found in high horse power cars. Comes with a liquid filled fuel pressure gauge and supplied with 5/16" hose outlet and -6AN fittings for easy install selection.