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 9/16”x18 fittings for users who want to use custom fuel lines. * No additional parts required for installation * Specifically engineered for each application * Manufactured and assembled in the USA * O.E. fuel pressure regulator or AEM adjustable fuel pressure regulator mounts directly to rail with no modifications * Comprehensive installation instructions, hardware, fittings and injector O-rings included PartNumber : aem25-131BK Description : High Volume Fuel Rail; Requires Adapter Kit Part # 25-391 Color : Black 2005-2006 Mitsubishi Lancer Evolution L4.1997cc Fuel Delivery::Fuel Rails 2003-2004 Mitsubishi Lancer Evolution L4.2000cc Fuel Delivery::Fuel Rails 2005-2006 Mitsubishi Lancer Evolution MR L4.1997cc Fuel Delivery::Fuel Rails 2005-2006 Mitsubishi Lancer Evolution RS L4.1997cc Fuel Delivery::Fuel Rails 2006 Mitsubishi Lancer Evolution SE L4.1997cc Fuel Delivery::Fuel Rails