IAG V3 Top Feed Fuel Rails – 02-14 WRX / 07-21 STI / 08-12 LGT / 06-13 FXT

The IAG V3 Top Feed Rails are precision machined from solid 6061 billet aluminum and feature an anodized black finish with the IAG logo engraved on top. Chosen for its durability, lightweight properties, and corrosion resistance, 6061 billet aluminum ensures that these fuel rails can handle the extreme demands of high-flowing, high-performance fuel systems.

Subaru’s OEM 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. 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 and IAG’s fuel rails were real-world tested to 1000hp.