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SKU: 2284-8
GSC P-D 2015-2021 Subaru Impreza WRX +1mm (35mm) Intake Valve Set Stainless Alloy 21-4N Chrome Polished
Enhance engine breathing on your 2015-2021 Subaru WRX with this GSC Power-Division +1mm intake valve set designed for the FA20 engine. These 35mm oversized valves deliver higher airflow for more power in turbocharged setups. Crafted for reliability under boost and high RPM this set replaces stock valves with precision components.
Key Features
- +1mm Oversize (35mm Head Diameter): Boosts intake flow volume for improved throttle response and horsepower gains
- 21-4N Stainless Steel Construction: Provides high fatigue strength and heat resistance ideal for boosted FA20 applications
- Chrome Polished Stems: Minimizes friction reduces guide wear and extends valve train life
- Swirl Polished Heads: Enhances airflow efficiency with smooth surface for maximum cylinder filling
- 113.80mm Overall Length: Exact fit specification with 6.98mm stem 10mm tip and 1.8mm margin ensures drop-in compatibility post-machining
Product Notes
- Cylinder head requires machining to seat +1mm valves properly
- Sold as complete set of 8 intake valves for one engine
- Inspect springs retainers and guides during service
Installation Notes
- Professional installation recommended.
- Valve seats must be cut 1mm larger using multi-angle cutter
- Compatible with OEM keepers seals and spring seats
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2021 | Subaru | Impreza WRX | Base |
| 2015-2021 | Subaru | Impreza WRX | Limited |
| 2015-2021 | Subaru | Impreza WRX | Premium |
Why Choose GSC Power-Division?
- Proven in Subaru racing and track applications
- Manufactured with tight tolerances for consistent performance
- Backed by lifetime warranty against manufacturing defects
Frequently Asked Questions
-
Q: Will this fit 2015-2021 Subaru STI models?
A: No this set fits WRX FA20F engines only STI EJ257 uses different valve sizing like GSC 2209 series -
Q: What makes the 21-4N material suitable for performance?
A: 21-4N stainless offers elevated strength and resists fatigue cracking under high boost and RPM loads common in WRX builds -
Q: What warranty applies and installation details?
A: Lifetime warranty covers defects requires professional install with head machining verify spring pressures exceed stock for safety
Shipping & Handling
- Method: Standard Ground
- Availability: In stock - ships same or next business day
- Packaging: Protective individual sleeves in compact box
- Weight: 1 lb
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