SKU: 2014-8 | UPC: GSC2014-8
GSC Power-Division 1998-2021 Subaru Impreza WRX STI EJ205/EJ207/EJ257 37mm Head (+1mm) Chrome Polished Intake Valve – Set of 8
GSC Power-Division chrome polished intake valves feature a 37mm head diameter and +1mm length for Subaru EJ205 EJ207 EJ257 engines in 1998-2021 Impreza WRX and STI models. This set of 8 delivers increased airflow to support higher boost and RPM for greater horsepower gains. Engineered for durability in turbocharged performance applications these valves pair with high-lift cams and upgraded springs.
Key Features
- 37mm Head Diameter: +1mm oversize over stock design increases intake airflow for improved throttle response and power output across the RPM range
- +1mm Valve Length: Extended stem matches GSC +1mm valve springs and high-lift camshafts without clearance issues
- Chrome Polished Stems: Smooth finish reduces friction promotes oil retention and extends valve guide life under high heat conditions
- One-Piece Forged Construction: 21-4N stainless steel withstands extreme boost and RPM with superior fatigue resistance
- Swirl Polished Underhead: Enhances flow efficiency and heat dissipation for consistent performance in demanding race or street use
Product Notes
- Requires valve seat machining due to oversize head diameter
- Pair with GSC valve springs for optimal spring pressure and lift
- Inspect cylinder head ports for compatibility with 37mm valves
Installation Notes
- Professional installation recommended.
- Perform 3-angle valve job on seats for proper sealing with oversize heads
- Compatible with OEM or GSC titanium retainers and spring kits
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX |
| 2004-2007 | Subaru | Impreza | WRX STI |
| 2008-2014 | Subaru | Impreza | WRX STI |
| 2015-2021 | Subaru | Impreza | WRX STI |
| 1998-2007 | Subaru | Impreza | STI (JDM EJ207) |
Why Choose GSC Power-Division?
- Proven in professional Subaru racing with multiple championship wins
- Manufactured with precision CNC machining for exact tolerances
- Tested to 12000 RPM on engine dynos for real-world reliability
Frequently Asked Questions
- Q: Will these valves fit 2008-2021 STI models with EJ257 engines?
A: Yes these are direct fit for all EJ257 equipped STI models from 2004-2021 including USDM and JDM variants - Q: What material are the valves made from?
A: One-piece forged 21-4N stainless steel heat treated for high-temperature strength with chrome polished stems - Q: What is the warranty on these valves?
A: GSC Power-Division provides a limited lifetime warranty against manufacturing defects when installed by certified professionals
Shipping &. Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Foam-lined protective box 12 x 8 x 2 inches
- Weight: 1.8 lbs
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