GSC Super Alloy Exhaust Valve – FA20 BRZ/FRS (GSC2121-01)
Engineered for High-Performance FA20 Builds
Designed specifically for the 2013 Subaru BRZ, Scion FR-S, and Toyota 86 platforms, the GSC Power-Division Super Alloy Exhaust Valve delivers exceptional durability and flow for high-horsepower FA20 engines. This standard-size 29mm valve is built to withstand extreme exhaust gas temperatures—up to 2000°F.
Technical Specifications
- Part Number: GSC2121-01
- Standard Head Size: 29mm
- Stem Diameter: 5.5mm
- Overall Length: 95.15mm
- Head Diameter: 29.00mm
Built for Strength, Flow, 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 savings, while swirl-polished and backcut heads enhance airflow without compromising strength.
Key Features:
- Handles EGTs up to 2000°F
- Chrome-polished stem for reduced friction
- Lightweight under-head dish design
- Swirl-polished and backcut for airflow gains
- Compatible with GSC bronze valve guides
Fitment:
- 2013 Subaru BRZ (FA20 engine)
- 2013 Scion FR-S (FA20 engine)
- 2013 Toyota 86 (FA20 engine)
Fitment Note
SPECIAL NOTE: This valve is designed for 2013 model year fitment only. Please verify compatibility before ordering.
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov

