AEM High Volume Fuel Rails feature a 1/2-inch fuel bore capable of flowing enough fuel to support most high-horsepower applications. This large bore also dampens back pulses created by larger injectors, and works perfectly with stock injector sizes. An additional 1/8th NTP port is included to accommodate a nitrous set up or fuel pressure gauge. A custom fuel line fitting is included for the factory fuel line, and the ends of the rail are pre-tapped to accept -6 or -8 AN fittings for users with custom fuel lines.