SKU: 2013-8 | UPC: GSC2013-8
GSC P-D Subaru EJ Series EJ205/EJ207/EJ257 33mm Head (+1mm) Chrome Polished Exhaust Valve – Set of 8 for 2002-2021 Impreza WRX STI
GSC Power-Division exhaust valves feature precise engineering for Subaru EJ205 EJ207 EJ257 engines in 2002-2021 Impreza WRX STI models. The 33mm head diameter (+1mm over stock) enhances exhaust flow for faster turbo spool and increased power output while the chrome polished finish resists wear. This set of 8 forged valves provides reliable performance in high-boost setups up to 40psi.
Key Features
- 33mm Head Diameter (+1mm): Larger size over stock improves exhaust evacuation for quicker turbo response and higher horsepower in WRX STI builds
- One-Piece Forged 21-4N Stainless Steel: Extreme heat resistance and strength handles high RPM and boost levels without failure in turbo engines
- Two-Stage Stem (6.98mm upper / 5.95mm lower): Enhanced sealing rigidity reduces flex and guides wear during aggressive driving and track use
- 113.95mm Overall Length: Exact OEM-spec length allows drop-in installation without head machining on EJ205 EJ207 EJ257
- Chrome Polished Top and Swirl Polished Under Head: Minimizes friction and guide wear to extend valve life in turbocharged Subaru applications
Product Notes
- Exhaust valves only set of 8 intake valves sold separately under GSC part 2004-8
- Heat treated for maximum durability in turbo applications up to 40psi boost
- Ships in protective foam-lined box to prevent damage
Installation Notes
- Professional installation recommended.
- Verify valve-to-piston clearance with clay method on high compression builds
- Compatible with stock heads GSC valve springs and multi-angle valve job
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 |
| 2002-2007 | Subaru | Impreza | WRX TR |
Why Choose GSC Power-Division?
- Proven in WRX STI race cars and drag builds worldwide
- Machined to micron tolerances in the USA for perfect fit
- Engineered specifically for Subaru EJ turbo valvetrain demands
Frequently Asked Questions
- Q: Do these fit 2006 WRX EJ255 turbo engine
A: Yes direct fit for all EJ205 EJ207 EJ257 exhaust ports in 2002-2021 USDM WRX STI models - Q: What finish and material details
A: One-piece 21-4N stainless steel with chrome polish on top swirl polish under head and heat treatment - Q: What warranty and install tips
A: Lifetime warranty against manufacturing defects pair with GSC titanium retainers for best results professional valve seat cut advised
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Foam-lined cardboard box 12 x 8 x 2 inches
- Weight: 1 lb
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