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SKU: 2017-8
GSC P-D EJ Series EJ205/EJ207/EJ257 Chrome Polished Super Alloy Exhaust Valve 33mm Head (+1mm) Set 8 for 2002-2021 Subaru Impreza WRX STI
GSC Power-Division P-D series exhaust valves deliver reliable performance for Subaru EJ205 EJ207 and EJ257 engines in Impreza WRX and STI models from 2002 to 2021. The 33mm head diameter provides +1mm over stock size to support higher exhaust flow in turbocharged setups. Chrome polished super alloy construction maintains integrity under extreme heat and boost pressure. This set of 8 covers the full exhaust side.
Key Features
- One-Piece Forged Super Alloy: Withstands high temperatures and boost levels in EJ205 EJ207 EJ257 engines for long-term durability
- Chrome Polished Tip: 11mm chrome polish on valve tip enhances heat dissipation and minimizes guide wear during hard use
- 33mm Oversized Head: +1mm larger than stock diameter increases exhaust flow for improved top-end power and response
- Swirl Polished Flow: Precision swirl polishing on head and margins optimizes gas flow dynamics
- Bead Blasted Undercut: Strengthens the valve structure while reducing weight for faster valve action
Product Notes
- Valve head specs: 33.00mm diameter 6.94mm stem 112.30mm overall length
- Pair with GSC valve springs and retainers for complete valvetrain upgrade
- Packaged in protective box for secure transit
Installation Notes
- Professional installation recommended.
- Requires valve seat machining for +1mm oversized head diameter
- Compatible with stock or aftermarket valve guides verify stem clearance
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 | WRX STI | - |
| 2005-2009 | Subaru | Legacy | GT |
| 2005-2009 | Subaru | Outback | XT |
| 2008-2013 | Subaru | Forester | XT |
Why Choose GSC Power-Division?
- Engineered and manufactured in the USA for Subaru turbo engines
- Trusted by professional racers in drag and road racing
- Machined to exact tolerances for drop-in fit after machining
Frequently Asked Questions
-
Q: Will this fit my 2010 STI with EJ257 engine?
A: Yes fits all EJ257-equipped STI models from 2004-2021 including 2008-2014 and 2015-2021 Impreza WRX STI -
Q: What material and finish are used?
A: One-piece forged super alloy with 11mm chrome polished tip swirl polished head and bead blasted undercut for heat resistance and flow -
Q: What is the warranty and install requirements?
A: Lifetime warranty against manufacturing defects professional valve job required for oversized head including seat cutting and lash adjustment
Shipping & Handling
- Method: Standard ground shipping
- Availability: In stock - ships same or next business day
- Packaging: Secure padded box approximately 6x4x2 inches
- Weight: Approximately 1 lb
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