This 0.69" big bore fuel rail is CNC machined from billet 6061 aluminum, black anodized, and laser etched for a high quality surface finish. It is a direct replacement for the OEM fuel rail. A plumbing kit is available that provides all the necessary parts to install and plumb the fuel rail with OEM components. This kit is compatible with all fuel types including popular alcohol mixtures such as E85. The OEM plastic spacers are reused to thermally insulate the fuel rail from the aluminum intake manifold. PORTS AND FITTINGS The fuel rail features four threaded ports that are all tapped for 8AN ORB. What is ORB?  8AN ORB Adapter Fittings can be found 8AN ORB Direct Mount Regulators can be found 8AN ORB Fuel Pulse Dampers can be found Fuel Pressure Gauge Adapters can be found If building a custom fuel setup, appropriate fittings must be selected based on the specific application. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide. COMPATIBILITY This fuel rail is compatible with the following vehicles. 1989-1993 Mazda MX-5 Miata 1993-1999 Mazda Xedos 6 1997-2003 Mazda Familia 1997-2003 Mazda Etude 1997-2004 Kia Sephia 1997-2004 Kia Shuma 1997-2004 Kia Spectra 1989-1993 Eunos Roadster FUEL INJECTOR COMPATIBILITY This fuel rail is compatible with factory or OEM equivalent fuel injectors. If upgrading fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating ‘OEM equivalent’. 20-0769-02 Fuel Rail, Mazda 1.6L B6This is the basic fuel rail, and only includes the fuel rail as shown in the picture below. Factory mounting hardware is re-used (consult install instructions for more info). This is ideal for high performance applications where the installer is going to build a custom fuel system. If using the factory regulator and fuel lines, consider purchasing the plumbing kit (below).