IAG Performance V3 Top Feed Fuel Rails Gold 2002-2014 WRX / 2007-2021 STI / 2008-2012 LGT / 2006-2013 FXT

The IAG Performance V3 Top Feed Billet Aluminum Fuel Rails with phenolic spacers are engineered to increase the fuel system capacity and power ceiling for your Subaru. Factory fuel rails operate in series, delivering fuel to each cylinder sequentially. At power levels above ~350 whp, the stock rails often struggle to supply adequate fuel to the last cylinder, risking lean conditions and potential catastrophic engine damage.

IAG’s billet fuel rails solve this with a parallel design, ensuring each cylinder receives equal fuel and consistent pressure. Machined to a 5/8" ID and compatible with -8 O-ring boss fittings, the rails provide significantly increased fuel volume and have been real-world tested to support up to 1000 hp.

Additional features include a port for an optional fuel pressure pulsation damper between injector pairs. This placement absorbs fuel oscillations closer to the injectors, maintaining stable fuel pressure more effectively than the stock damper located farther away.

Phenolic spacers are included between the rails and TGVs to reduce heat transfer from the engine to the fuel, helping maintain cooler, more stable fuel temperatures. Two spacer sizes are provided to accommodate various fuel injector fitments, ensuring optimal compatibility and performance.

Features:

• CNC machined from billet aluminum
• 5/8” Bore I.D. designed to accept -8 O-ring boss fittings
• 2 piece mounting design (Phenolic Thermo Spacers)
• Recessed mounting hardware
• Integrated port for fuel damper between injectors
• Engraved with IAG Logo

Includes:

• (x2) Billet Fuel Rail
• (x4) Zinc coated M8x30mm socket head cap bolt
• (x4) Phenolic Long Spacers
• (x4) O-rings
• (x2) Hex Head Threaded Plugs

Installation Instructions