AEM High Volume Fuel Rails + Adjustable Fuel Regulator. AEM High Volume fuel rails feature a 1/2-inch fuel bore to support fuel flow for applications up to 1,000 horsepower. This large bore also dampens backpressure pulses created by larger injectors and works perfectly with stock injector sizes. An additional 1/8th NPT port is included to accommodate a nitrous set up or fuel pressure gauge. A custom fuel line fitting is included for the factory fuel line, and in most cases the ends of each rail are pre tapped to accept -6 AN or 9/16×18 fittings for users who want to use custom fuel lines. 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. High Volume Fuel Rail. Supports fuel flow up to 1,000 horsepower. No additional parts required for installation – installs with factory fuel line using supplied fitting. Pre-tapped for -6 AN or 9/16x 18 fittings(Excluding 25-130BK). Specifically engineered for each application. Works with factory fuel line or custom fuel lines. 1/2 inch bore dampens backpressure pulses from larger fuel injectors. Comprehensive installation instructions, hardware, fittings and injector O-rings included. CNC Machined from billet aluminum. Black anodizing with laser engraving. Complete hardware, fittings and injector O-rings included. Adjustable Fuel Pressure Regulator. 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.