GSC Super Alloy +1mm Exhaust Valve – EJ20/EJ257 Turbo (GSC2017-01)
Designed for High-Heat, High-Horsepower EJ Turbo Builds
Engineered for Subaru EJ20 and EJ257 turbocharged applications, the GSC Power-Division Super Alloy Exhaust Valve with a +1mm oversized head delivers exceptional durability in extreme conditions. Ideal for setups pushing elevated exhaust gas temperatures—up to 2000°F.
Precision Specifications
- Part Number: GSC2017-01
- Oversized Head: +1mm (33mm)
- Stem Diameter: 6.0mm
- Overall Length: 104.25mm
- Head Diameter: 33.00mm
Built for Flow, Strength, and Longevity
Each valve features a chrome-polished stem for smoother movement and extended wear—especially when paired with GSC Manganese bronze valve guides. The under-head dish is optimized for weight reduction, while swirl-polished and backcut heads enhance airflow without compromising strength.
Key Features:
- Withstands EGTs up to 2000°F
- Chrome-polished stem for reduced friction
- +1mm oversized head for improved flow
- Lightweight under-head dish design
- Swirl-polished and backcut for airflow gains
Ideal for Aggressive EJ Turbo Applications
Whether you're building for track, street, or high-boost reliability, this +1mm Super Alloy Exhaust Valve is the perfect upgrade for your EJ20 or EJ257 turbo engine.
Fitment:
- 2002–2005 Subaru WRX (EJ205 Turbo)
- 2004–2007 Subaru WRX STI (EJ257 Turbo)
- 2006–2014 Subaru WRX (EJ255 Turbo)
- 2008–2021 Subaru WRX STI (EJ257 Turbo)
- 1989–2001 Subaru Legacy GT/RS (EJ20 Turbo, JDM)
- 1992–2000 Subaru Impreza WRX (EJ20 Turbo, JDM)
- 1999–2001 Subaru Impreza WRX STI (EJ207 Turbo, JDM)
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
