RCM Parallel Fuel Rail Kit / Standard Fuel Regulator (Spec-C Models)

Ease of Fitment Guide: Intermediate

List Price (exc VAT): £495.00 Sale price Your Price: £594.00
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Parallel fuel lines are a great addition to any engine, not only do they provide a more consistent volume of fuel to your injectors but they also yield key safety benefits.

With Subaru's standard fuel system design, fuel is fed by a pump from the tank to the front of your car passing through the fuel filter (located in the engine bay) before being fed into the fuel rails. Fuel is then delivered to each cylinder one by one, starting with cylinder four.The fuel pressure regulator (situated at the end of your fuel rails) acts like a flood gate, backing up the fuel pressure to ensure a good supply is available for each cylinder.

Experience and logic tells us that a far more efficient way of fueling the engine would be to supply each cylinder with its own equal amount of fuel, ensuring no cylinder is left "thirsty" compared to the rest. This is where a Parallel Fuel Rail design is a far more effective, safe and regulated way of fueling your engine.

With RCM's Parallel Fuel Rail Kits fuel exits the fuel filter and is then passed through a Y-piece separator which directs fuel to each rail at the same time. Not only does this solve the problem of one cylinder running lean but it also enables the system to hold more fuel in reserve (thanks to the increased diameter fuel rails and lines).

This particular kit is designed for use with a un-modified vehicle where maintaining engine safety is the primary goal. Supplied with a conversion bracket to connect your standard fuel pressure regulator the car does not require any form of mapping or manual tuning after installation.

If your vehicle is modified to increase power then we suggest our Parallel Fuel Rail Kit with our Performance Fuel Regulator which will allow complete control over fuel pressures where a greater volume of fuel will be required.

Fuel Rails:

• Manufactured from T6061 aluminium.

• Military grade anodised finish.

• CNC machined aluminium mounting brackets.

• Stainless Steel Male / Male fittings for each rail end (15mm shoulder to -6 thread).

• X4 M5x12 Cap Head Screws and matching spring washers for securing each bracket to the fuel rail extrusion.

• X4 M8x20 Cap Head Screws and matching spring washers for securing each bracket to the inlet manifold. 

• X4 Nitrile Rubber O-Rings to seal each fuel rail end to its given fitting.


Fuel Lines:

• Material: Goodridge 200 series -6 Braided Nitrile Hose.

• Fittings: Swept Alloy (Cutter style, Re-usable), Alloy Hose End Finishers, Supplied pre assembled.


Bracket & Fittings:

• Adapter manufactured from T6061 Alloy.

• Military grade anodised finish.

• Stainless Steel Male / Male fittings for each rail end (15mm shoulder to -6 thread).

• Aluminium swaged mounting bracket.

• Alloy -6 Y-piece

• Ensure equal supply of fuel to each cylinder.

• Reduces the possibility of cylinder three running lean.

• Allows a higher volume of fuel for immediate reserve.

• Dramatically improves engine bay appearance.


Available for WRX & STI Model Impreza from 2001-2006 (also known as V7 to V9).

Please note; Vehicles manufactured for the Japanese Domestic Market which utilize a one piece aluminium inlet manifold require a specific kit. UK and European vehicles use a flat mounting bracket between the fuel rail and inlet manifold whereas JDM vehicles have a raised / stepped bracket.

IF you require confirmation of which kit is applicable to your vehicle then please contact us with your chassis number.

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