Skunk2’s Composite Fuel Rails are made using a proprietary casting process, from a carbon reinforced aerospace thermo-polymer composite that is 33% lighter, 60% stronger, and runs up to 100 degrees (F) cooler than aluminum. The Composite Fuel Rail insulates fuel from both radiant and conductive heat transfer underneath the hood better than aluminum, resulting in increased horsepower and torque. Composite Fuel Rails also feature large 0.625-inch internal bores for superior fuel injector pulsation dampening, machined with a smooth interior finish and feature radius-cut fuel injector outlets for improved flow characteristics. Conventional extruded and drilled aluminum rails are typically flawed by design due to machine limitations, resulting sharp internal angles where the main bore meets the fuel injector bores. Eliminating this design flaw limitation can only be achieved with the natural-flow-moldable composite materials. Skunk2’s Composite Fuel Rails are compatible with the factory fuel system, as well as all pump and race fuels, including alcohol. The Skunk2 Composite Fuel Rail can support up to 1,200hp, with gains as high as three percent realized during testing. Features: · Up to 3% Gain Just by Keeping Fuel Cooler · -8 AN End Threads with 0.625" Internal Bore · Can Support Up to 1200HP · Can Be Used with Stock Fuel System · Chemical Resistant to All Fuels including Alcohol