IAG V3 Top Feed Fuel Rails Gold – Subaru Models (inc. 2002-2014 WRX / 2007+ STI)

IAG V3 Top Feed Fuel Rails — Gold — 2002-2014 WRX / 2007+ STI / 2008-2012 LGT / 2006-2013 FXT

Top-Feed Conversion for Higher Fuel Flow
The IAG V3 Top Feed Fuel Rails enable a side-feed to top-feed injector conversion on EJ-series Subaru engines, unlocking access to a wider range of high-flow injectors and raising the fuel delivery ceiling for high-horsepower builds. CNC-machined from billet 6061 aluminum in a parallel flow format, the rails are engineered for consistent fuel pressure across all cylinders. Available in Gold anodized finish.

DETAILS

• Color: Gold anodized finish
• CNC-machined billet 6061 aluminum construction
• Parallel flow format for consistent fuel pressure across all injectors
• 5/8″ bore I.D. — accepts -8 O-ring boss fittings
• Integrated port for optional fuel pressure damper between each injector pair
• 2-piece mounting design with phenolic thermal spacers (reduces heat transfer)
• Recessed mounting hardware
• IAG logo laser-engraved
• Package includes: (2) billet fuel rails, (4) zinc-coated M8x30mm socket head cap bolts, (4) phenolic short spacers, (4) phenolic long spacers, (4) O-rings, (2) hex head threaded plugs
• Fits: 2002-2014 WRX / 2007-2017 STI / 2008-2012 Legacy GT / 2006-2013 Forester XT

Top-Feed vs Side-Feed: Why Upgrade
The factory EJ-series side-feed fuel rail limits available injector options and fuel flow capacity. Top-feed rails open up access to the full range of high-flow injectors from Injector Dynamics, Bosch, and other suppliers that are available in top-feed format — enabling fuel delivery for 350 BHP and well beyond. If you are building past the limits of the stock fuel system, a top-feed conversion is the foundation of the upgrade.

V3 Rail Design Details
IAG’s V3 Top Feed Fuel Rails are CNC-machined from billet 6061 aluminum in a parallel flow format. A 5/8″ bore I.D. accepts -8 O-ring boss fittings. The 2-piece mounting design uses phenolic thermal spacers to reduce heat transfer from the intake manifold to the fuel. An integrated port between each pair of injectors accommodates an optional fuel pressure damper. Recessed mounting hardware keeps a clean appearance. Each pair is laser-engraved with the IAG logo.

Color is Cosmetic Only
The Gold finish is purely aesthetic. All three color variants of the V3 Top Feed Fuel Rails — Black, Red, and Gold — are identical in construction, dimensions, and performance. Choose based on your engine bay color scheme.

Why Choose IAG Performance

IAG Performance has been building Subaru-specific engine and drivetrain components since 2001, and in that time they have become the standard by which serious Subaru builds are measured. Based in Westminster, Maryland, IAG designs, machines, and assembles their products in-house using Haas CNC equipment and their own engineering team. Their catalog spans everything from short blocks and long blocks rated to 1150 BHP all the way down to the fuel system, oiling, and drivetrain hardware that keeps modified Subarus running reliably for years. Every IAG product exists because a problem needed a better solution than what was available — and the engineering shows.

The RallySport Take

The IAG V3 Top Feed Fuel Rails are the standard top-feed conversion in the Subaru EJ performance community. If you are stepping into larger injectors and an E85 or high-power fuel setup, these rails are the correct foundation. Made in the USA at IAG’s Westminster, Maryland facility.

Fitment