Will not work with factory fuel lines. Bolts directly to the factory fuel rail. Includes 1 regulator with integrated #6 return fitting. The base is one piece for extra clearance when attaching the braided fuel line onto the #6 bottom. Includes a #8 feed fitting to screw into the feed side of the factor fuel rail. Includes 2 additional #8 fittings that screw into the factory fuel filter. Fuel filter NOT included, I already put it into a car. Also includes rebuild kit for the regulator.