Black Billet Fuel Rail Kit For OE LS1 LS6 Intake Manifold 6AN + Hardware FPR-1045 Fuel rails are CNC-machined to precise tolerances and anodized black for a finished appearance.Designed for OE-style LS intake manifolds, these aluminum EFI fuel rails support engines producing over 1, 100 horsepower.Each rail features a 1/2 inch inner bore to reduce fuel pressure drop, minimize back pulses, and proper fuel distribution to all injectors.The kit includes matching fittings, a crossover hose, and necessary hardware for installation.