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SKU: B2017-50
GSC P-D Subaru EJ207/EJ257 Chrome Polished Super Alloy Exhaust Valve - 33mm Head (+1mm) - Set of 50 2002-2021 STI
GSC Power-Division exhaust valves deliver reliable performance for Subaru STI builds with EJ207 and EJ257 engines. This set of 50 features 33mm heads with +1mm stem length designed for 2002-2021 STI models including USDM WRX STI and JDM Impreza STI. Chrome polished finish reduces friction for better heat dissipation and smoother operation at high RPMs.
Key Features
- Inconel 751 Super Alloy: Handles temperatures up to 1525°F with resistance to fatigue and corrosion for long-life in boosted applications
- Chrome Polished Finish: Lowers port friction and accelerates heat transfer away from the valve improving thermal efficiency
- 33mm Head Diameter: Enhances exhaust flow for increased power output in high-performance turbocharged setups
- +1mm Stem Length: Provides precise clearance for aftermarket valvetrain components and high-lift cams
- Swirl Polished Stems: Minimizes oil residue buildup and guides for stable valve motion up to 10mm lift
Product Notes
- Valve margins prepped for production seat widths verify compatibility during mock-up
- Inspect valve seats and guides before installation to ensure proper sealing
- Set of 50 suits race teams or machine shops handling multiple engine builds
Installation Notes
- Professional installation recommended.
- Machine valve seats to match 33mm head and +1mm stem use lapping compound for seal
- Compatible with stock or aftermarket retainers and springs from GSC or others
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2007 | Subaru | Impreza | WRX STI |
| 2008-2014 | Subaru | Impreza | WRX STI |
| 2015-2021 | Subaru | WRX | STI |
| 2002-2007 | Subaru | Impreza WRX STI | JDM GD/GDB EJ207 |
| 2008-2021 | Subaru | Impreza WRX STI | JDM GR/GV EJ207 |
Why Choose GSC Power-Division?
- Engineered specifically for Subaru motorsport with proven track record in STI racing
- Manufactured to tight tolerances for drop-in fit and consistent performance
- Backed by real-world testing in high-boost drag and rally applications
Frequently Asked Questions
-
Q: Will these fit my 2006 USDM STI EJ257?
A: Yes B2017-50 valves match 2004-2021 EJ257 heads with 33mm exhaust ports and +1mm stem for STI valvetrain -
Q: What material resists heat best in turbo setups?
A: Inconel 751 super alloy construction endures 1525°F exhaust gas temps chrome polish aids cooling -
Q: Do I need special tools for install?
A: Standard valve job tools required professional shop advised for seat machining and spring matching
Shipping & Handling
- Method: Standard ground shipping
- Availability: In stock - ships same or next business day
- Packaging: Secure padded box 12x8x6 inches
- Weight: 3.5 lbs
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