Stage X Parallel Fuel Rail Kit / Rotated Turbo (SPEC-C MODELS)

Parallel fuel lines deliver a more consistent volume of fuel to the injectors and bring key safety benefits.

In Subaru's standard fuel system, the pump feeds fuel from the tank to the front of the car, through the fuel filter in the engine bay and into the fuel rails. Fuel then reaches the cylinders one by one, starting with cylinder four. The fuel pressure regulator at the end of the rails acts like a flood gate, backing up fuel pressure so each cylinder has a supply.

A more efficient approach is to give every cylinder its own equal amount of fuel, so none is left "thirsty" compared to the rest. A parallel fuel rail design does this in a more effective, safer and better-regulated way.

In this kit, fuel leaves the fuel filter and passes through a Y-piece separator that sends it to both rails at the same time. This removes the problem of one cylinder running lean, and the larger-diameter rails and lines let the system hold more fuel in reserve.

This kit is designed for modified vehicles fitted with the Stage X Rotated Turbo Kit, where fuel control is essential to maintaining power and engine safety. The included performance fuel pressure regulator gives maximum fuel control with minimum flow restriction, for engines up to and beyond 1500 HP. Developed with advanced bypass technology and an enlarged port design for accurate fuel pressure control across the range, the regulator lets the fuel pump push more, draw less current and always meet fuel volume demand with no pressure creep.

After installation, remapping the vehicle is recommended so that all ECU fuelling parameters are matched.