D Series Fuel Rail Civic Si SOHC For Skunk2 Manifold Fpr Gauge Line Hose 3 Bolt  Fits: D16Z6, D16A6, D15B2, D15B7, D15B8, D15Z1 and D15B6.  Application: D-Series Engines Features:  High Flow Fuel Rail, Fuel Pressure Regulator, and Fuel Pressure Gauge OE fuel pressure regulator or adjustable fuel pressure regulator mounts directly to rail with no modifications 1/8th NPT port is included to accommodate a nitrous set up or a fuel pressure gauge 1/2" fuel bore to support fuel flow for applications up to 1000 horsepower A custom fuel line fitting is included for the factory fuel line and the ends of each rail are tapped to accept -6 AN or 9/16" x 18 fittings for users who want to use custom fuel lines. Details:  Made From High Quality Black Anondized Aluminum Package Includes:  1x High-Flow Fuel Rail Kit (100% Brand New Never Used Or Installed) 1 x Fuel Pressure Regulator Kit  1 x Fuel Pressure Gauge  Includes ALL Hardware As Pictured