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AEM High Volume fuel rails feature a 1/2-inch fuel bore to support fuel flow for applications up to 1 000 horsepower. This large bore also dampens backpressure pulses created by larger injectors and works perfectly with stock injector sizes. An additional 1/8th NPT 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 each rail are pre tapped to accept -6 AN or 9/16x18 fittings for users who want to use custom fuel lines.