AEM Adjustable Fuel Pressure Regulators. AEM’s Honda/Acura Adjustable Fuel Pressure Regulators are capable of supporting enough fuel flow for engines up to 1000 horsepower. Our patented interchangeable discharge ports enable the regulator’s output to match the output of any fuel pump. AEM includes a custom barb fitting to accommodate the factory fuel hose and the base of each regulator is tapped to accept a -6 AN or 9/16×18 fittings. THIS PRODUCT MAY BE USED SOLELY ON VEHICLES USED IN SANCTIONED COMPETITION WHICH MAY NEVER BE USED UPON A PUBLIC ROAD OR HIGHWAY, UNLESS PERMITTED BY SPECIFIC REGULATORY EXEMPTION VISIT THE “EMISSIONS” PAGE AT. FOR STATE BY STATE DETAILS. IT IS THE RESPONSIBILITY OF THE INSTALLER AND/OR USER OF THIS PRODUCT TO ENSURE THAT IT IS USED IN COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. CNC-machined from 6061-T6 billet aluminum. Mounts directly to O. Fuel rail or AEM High Volume Fuel Rail. Patented interchangeable discharge orifices match output of virtually any fuel pump. Accept a -6 AN or 9/16×18 fittings. Adjustable from 20 psi to maximum fuel pump capacity. Interchangeable discharge ports match regulator output to output of any fuel pump. No additional parts required for installation. Manufactured and assembled in the USA. The free listing tool.