GSC 2014-8 +1mm 37mm Intake Valves Set of 8 for 02-21 Subaru EJ Turbo

Vehicle Fitment

• 2002-2005 Subaru WRX (EJ20/EJ25 turbo)
• 2004-2007 Subaru WRX STI (EJ25 turbo)
• 2008-2014 Subaru WRX STI (EJ25 turbo)
• 2015-2021 Subaru WRX STI (EJ25 turbo)
• 2004-2008 Subaru Forester XT (EJ25 turbo)
• 2005-2009 Subaru Legacy GT (EJ25 turbo)
• 2007-2009 Subaru Legacy GT Spec B (EJ25 turbo)
• Additional Subaru EJ20/EJ25 turbo engines where 37 mm +1mm intake valves are specified

Features

• GSC Power-Division high-flow intake valve set (37 mm +1mm oversize)
• Chrome-polished stems reduce friction and promote smooth valve guide movement
• Swirl-polished heads improve airflow and combustion efficiency
• Back-cut valve head design reduces mass for higher RPM capability
• Modified 21-4N stainless steel for strength and heat resistance
• Optimized valve tip height and keeper groove for precise valvetrain geometry
• Enhanced sealing and reduced distortion under performance conditions
• Direct replacement for performance builds and high-boost applications

Specifications

• Brand: GSC Power-Division
• Part Number: 2014-8
• Valve Type: Intake
• Quantity: Set of 8 valves
• Head Diameter: 37 mm (+1 mm oversize)
• Material: Modified 21-4N stainless steel
• Valve Stem Diameter: 6.0 mm
• Overall Length: ~104 mm

Included Components

• 1x Set of 8 intake valves (37 mm +1mm)
• Note: Valve springs, retainers, seals, and keepers not included

Product Description

The GSC 2014-8 intake valve set from GSC Power-Division includes eight high-performance intake valves engineered for turbocharged Subaru EJ20 and EJ25 engines. With a 37 mm head diameter - 1 mm larger than stock - these valves increase intake airflow potential, supporting higher horsepower, elevated boost, and greater RPM capacity in performance builds. Chrome-polished stems and swirl-polished heads reduce friction and enhance airflow, improving throttle response and combustion efficiency across the powerband.

Designed for direct fitment in a wide range of Subaru turbo models including WRX and WRX STI (2002-2021) as well as select Forester XT and Legacy GT applications, these oversize intake valves are ideal for engine rebuilds, high-boost setups, and upgraded camshaft profiles. Professional installation including proper valve seat machining and matching valve springs is recommended to fully leverage the performance benefits.