IAG V2 Top Feed Fuel Rails Gold WRX 2002-2014 / STI 2007-2016 / Legacy GT 2007-2012 / Forester XT 2006-2013
The IAG Performance V2 Top Feed Billet Aluminum Fuel Rails are designed to increase the power ceiling on your Subaru's fuel system. The factory fuel rails function in a series, which means that each cylinder's fuel is delivered after the other. As horsepower rises past the 350whp mark, the stock rail often does not have the capacity to deliver fuel to the last cylinder effectively*. As a result, that last cylinder can run lean, which can result in catastrophic failure. The IAG billet fuel rails are designed to eliminate this problem. First, our fuel rails operate in parallel format, each cylinder bank receives equal fuel, matching the flow between the rails ensures that each injector sees the same fuel pressure. Second, the bore of our rail is machined to 5/8" ID and is designed to accept -8 o-ring boss fittings. This configuration greatly increases the volume of the rail which means that more fuel is available at higher power levels. These fuel rails were real world tested to 850hp. The V2 fuel rails also feature a port to add an optional fuel damper between each pair of injectors. Fuel dampers absorb fuel oscillations caused by injectors opening and closing. All Subaru’s are equipped with a fuel damper however its location is some distance from the injectors. The IAG V2 rails locate the damper between the injectors to smooth out the fuel flow.
The fuel rails are engineered and manufactured at the IAG facility in Westminster, Maryland. The rails are machined from a solid block of 6061 billet aluminum and feature an anodized black finish with the IAG engraved logo on the top.
(x2) Billet Fuel Rail
(x4) Zinc coated M8x20mm socket head cap bolt
(x2) Hex Head Threaded Plugs
(x8) 8mm Flat Washers
(x2) Fuel Dampers (x2)
*Install note: the (x2) hex head threaded plugs should be torqued to 55 ft/lbs.
Confirmed To Fit: Injector Dynamics
- CNC machined from billet aluminum
- 5/8” Bore I.D. designed to accept -8 o-ring boss fittings
- 1 piece mounting design (No spacers or washer stacking required)
- Recessed mounting hardware
- Integrated port for fuel damper between injectors
- Reduced weight over previous models
- Engraved with IAG Logo
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