This is the STi Fuel Rail System, for those building a complete, custom fuel system. Featuring a completely custom, CNC-machined, 6061-T6 aircraft quality aluminum fuel rail, these guys are simply a work of art. Of course they’re finished with our Aeromotive Red, bright-dip anodized finish and include integral, billet mounting brackets for a direct bolt-on installation to the stock intake manifold. Includes: Adjustable Fuel Pressure Regulator, Fuel Pressure Gauge, fuel rails and all necessary lines and fittings. Application: ’04-’06 STi