The fuel rails are machined from 6061 aluminum and anodized black for compatibility with all popular fuel types including E85. Manufactured with a large internal bore, the fuel rail can support all necessary engine power requirements. Each rail has four 8AN ORB ports (2 end ports and 2 bottom ports). The fuel rail features 14mm injector bores and is compatible with the OEM injectors and any aftermarket injectors with OEM VQ fitment. There is also opportunity to plumb the fuel rails in several different configurations, including parallel, series, or a return system. NOTE: Because of the OEM intake manifold mounting bosses, two Radium 14-0150 8AN ORB plugs must be used in 1 of each of the center ports for VQ35DE engines ONLY. As shown Above, the base kit (P/N: 20-0458) includes ONLY the fuel rails and associated mounting hardware. NO FITTINGS ARE INCLUDED.