HIGH-FLOW FUEL RAILS CNC machined T6 billet aluminum-laser-etched graphics for outstanding looks 1/2" diam. fuel bore ensures enough flow to support most high-performance engines Large bore also dampens back pulse created by oversized injectors in high-output injectors (also works with stock injectors) Ready to install-no additional parts needed Rail is specifically designed for your car. Ends are tapped to accept either 6" or 8" line. Custom fitting allows use of stock fuel hose. Stock fuel pressure regulator or AEM's adjustable fuel pressure regulator (not included) mounts directly to fuel rail. Additional port allows installation of a nitrous setup or external fuel pressure gauge (both not included). Includes new injector O-rings, fuel line fittings, comprehensive instructions and AEM decals.