GSC +1mm Oversized Exhaust Valve – FA20F WRX (GSC2283-01)
Oversized Performance Exhaust Valve for 2015–2024 Subaru WRX FA20F
Designed for the 2015+ Subaru WRX FA20F, the GSC Power-Division +1mm Exhaust Valve offers increased flow capacity and long-term durability. This single valve features a 30mm head diameter—1mm larger than stock—and precision-machined stem geometry, ideal for high-boost, high-RPM applications.
Technical Specifications
- Part Number: GSC2283-01
- Head Diameter: 30.00mm (1.181")
- Stem Diameter: 5.5mm (0.215")
- Overall Length: 97.90mm (3.854")
Engineered for Flow, Strength, and Reliability
GSC’s oversized exhaust valves are developed using advanced 3D simulation and modeling software to deliver a stronger, higher-flowing head profile. Each prototype is tested in its target engine platform to ensure optimal performance. Reduced face distortion improves sealing under extreme conditions, resulting in consistent output and extended valve life.
Key Features:
- Swirl-polished heads improve exhaust flow and valve aerodynamics
- Backcut design reduces weight for improved RPM capability
- Micro-polished stems minimize oil drag and enhance guide movement
- Made from modified 23-8n stainless steel for heat resistance and durability
- Stellite-tipped or hardened valve ends for extended wear protection
- Optimized tip height for better geometry and faster lash setup
- Balanced keeper groove to reduce spring shims and maximize kit performance
- Compatible with OEM or upgraded keepers/locks (reuse not recommended for performance builds)
Fitment Note
Application: Designed specifically for 2015–2024 Subaru WRX FA20F engines. Please confirm fitment before ordering.
Fitment:
- 2015 Subaru WRX FA20F
- 2016 Subaru WRX FA20F
- 2017 Subaru WRX FA20F
- 2018 Subaru WRX FA20F
- 2019 Subaru WRX FA20F
- 2020 Subaru WRX FA20F
- 2021 Subaru WRX FA20F
- 2022 Subaru WRX FA20F
- 2023 Subaru WRX FA20F
- 2024 Subaru WRX FA20F
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
