-15%
Click to zoom in
SKU: 3025
GSC P-D Subaru EJ205 EJ207 EJ257 Manganese Bronze Exhaust Valve Guide Stopper Style - Single 2002-2021 Impreza WRX STI
This GSC Power-Division manganese bronze exhaust valve guide stopper fits Subaru EJ205 EJ207 and EJ257 engines found in WRX and STI models. Designed as a single unit for one exhaust valve position it secures the guide with exact tolerances to handle high heat and boost levels. Ideal for engine rebuilds it prevents guide migration and supports reliable valve train operation under demanding conditions.
Key Features
- Manganese Bronze Material: Provides exceptional wear resistance and thermal conductivity suited for exhaust valve environments in turbocharged Subaru engines
- Stopper Style Design: Locks the valve guide in place reducing movement and extending component life during high RPM operation
- Precision CNC Machined: Matches OEM specifications for seamless integration with stock or aftermarket cylinder heads and valves
- EJ205 EJ207 EJ257 Compatible: Direct fit for popular Subaru turbo engines in WRX and STI applications from 2002 to 2021
- Single Exhaust Unit: Allows targeted replacement for individual valves simplifying maintenance on performance builds
Product Notes
- Sold as single piece for exhaust position only pair with intake guides for complete set
- Inspect cylinder head during installation for proper guide seating
- Lightweight component ships in protective packaging to prevent damage
Installation Notes
- Professional installation recommended.
- Remove cylinder head and press out old guides before installing new stopper
- Compatible with GSC valves guides and OEM hardware use assembly lube on guide
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX |
| 2004-2021 | Subaru | Impreza WRX | STI |
| 2005-2007 | Subaru | Impreza WRX | TR |
| 2008-2014 | Subaru | Impreza WRX | STI Hatchback |
| 2015-2021 | Subaru | WRX STI | - |
Why Choose GSC Power-Division?
- Proven in professional racing with Subaru teams worldwide
- High-strength materials tested for extreme boost and heat cycles
- Engineered for direct bolt-on reliability in performance Subaru builds
Frequently Asked Questions
-
Q: Will this fit 2004-2021 Subaru STI models with EJ257 engines?
A: Yes it directly fits all EJ257 exhaust positions in 2004-2021 Impreza WRX STI cylinder heads -
Q: What makes manganese bronze suitable for this valve guide stopper?
A: Manganese bronze offers superior hardness and resistance to exhaust gas corrosion while maintaining tight tolerances under thermal expansion -
Q: Is there a warranty on this GSC part?
A: GSC Power-Division provides a limited lifetime warranty against manufacturing defects when installed by certified technicians
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock - ships same or next business day
- Packaging: Protective padded envelope 4 x 4 x 1 inches
- Weight: 0.06 lbs
GSC Power Division
GSC Power Division is a manufacturer of precision-engineered camshafts, valve springs, and valvetrain components designed for high-performance and competition engines across domestic, import, and diesel platforms. Founded by engineers with deep roots in motorsport, GSC Power Division components are machined to exacting tolerances and heat-treated to survive the demands of forced induction and high-rpm applications that destroy stock valvetrain parts. The brand is particularly well-known in the Mitsubishi Evo, Subaru STI, Nissan RB, and Toyota 2JZ communities where aggressive camshaft profiles are essential for extracting maximum power from turbocharged four-cylinder and six-cylinder engines. Whether building for drag racing, road course competition, or a high-powered street car, GSC Power Division camshafts and valve springs are a proven upgrade path. Popular Upgrades GSC Power Division S1, S2, and S3 camshafts are the most popular selections, with each profile offering progressivel...
View GSC Power Division Products
Valve Guides
Welcome to our Valve Guides collection, where you can find a wide range of high-quality products designed to enhance your automotive performance. Our carefully curated selection includes everything you need to ensure optimal functionality and longevity for your vehicle's engine components. Why Choose Our Valve Guides? Durability: Constructed from premium materials to withstand high temperatures and pressure. Precision Engineering: Designed for a perfect fit, ensuring smooth operation and reduced wear. Performance Boost: Improves engine efficiency and power output, maximizing your vehicle's performance. Wide Selection: Available for various makes and models, tailored to meet your specific needs. Featured Products Explore some of our top-rated valve guides: High-Performance Valve Guides - Ideal for racing and high-performance engines. OEM Replacement Valve Guides - Perfect for restoring your vehicle to factory specifications. Custom Valve Guides - Tailor-made options for sp...
View Valve Guides Products
Valves & Components
Browse all of our valves and valvetrain components at Black Ops Auto Works, including engine valves, valve covers, valve cover gaskets, valve guides, valve springs, retainers, valve locks, valve seals, lash caps, and related valvetrain hardware for performance builds, engine refreshes, and high-horsepower applications. Whether you are rebuilding a cylinder head, upgrading your valvetrain for higher RPM, or replacing worn valve train components, this collection is built for customers searching for engine valves, valve springs and retainers, valve cover gaskets, performance valve covers, and valvetrain upgrades. Shop Top Valvetrain Brands Find trusted brands in the valve and valvetrain category, including: GSC Power Division Supertech Brian Crower Ferrea Manley Performance Cometic Granatelli Moroso BLOX Racing These brands are known for performance intake valves, exhaust valves, valve spring kits, titanium retainers, valve guides, valve locks, valve seals, billet valve covers, an...
View Valves & Components Products