SKU: 5743 | UPC: GSC5743
GSC P-D Subaru EJ Turbo DOHC Valve Spring & Ti Retainer Kit 1999-2015 Impreza WRX STI
GSC Power-Division P-D series valve spring and titanium retainer kit upgrades Subaru EJ turbo DOHC engines for high boost and RPM. Designed for 1999-2015 Impreza WRX STI and compatible models it prevents valve float with precise pressures. Install this kit to maintain valve control during aggressive driving and tuning.
Key Features
- Seat Pressure 120 lbs @ 1.750″: Ensures stable valve seating and control at idle and low lift for everyday drivability
- Open Pressure 280 lbs @ .440″ lift: Locks valves shut at peak boost and high RPM to avoid float in turbo applications
- Titanium Retainers: Cuts valvetrain weight by 60% over steel for faster revving and reduced stress on components
- 10,400 RPM Capability: Supports extreme engine speeds safely with coil bind at 1.180″ and 185 lbs/in rate
- Swift Spring Material: Heat treated chrome silicon steel construction delivers consistent performance and fatigue resistance
Product Notes
- Kit contains 16 valve springs 16 titanium retainers and 16 spring seats for complete DOHC head coverage
- Black nitride coated retainers resist wear in high heat turbo environments
- Packaged securely to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Use GSC or Subaru-specific valve spring compressor tool for safe removal and install
- Verify installed spring heights and retainer to guide clearance post-installation
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2005-2011 | Subaru | Impreza | Outback Sport |
| 2012-2014 | Subaru | Impreza | Premium |
| 1999-2005 | Subaru | Impreza | RS |
| 2012-2014 | Subaru | Impreza | Sport Limited |
| 2012-2014 | Subaru | Impreza | Sport Premium |
| 2002-2004 | Subaru | Impreza | TS |
| 2002-2014 | Subaru | Impreza | WRX |
| 2005 | Saab | 9-2X | Aero |
| 2009-2010 | Subaru | Impreza | 2.5 GT |
| 2006-2011 | Subaru | Impreza | 2.5i |
| 2010-2011 | Subaru | Impreza | 2.5i Premium |
| 2012-2014 | Subaru | Impreza | Base |
| 1999-2001 | Subaru | Impreza | L |
| 2012-2014 | Subaru | Impreza | Limited |
| 1999-2004 | Subaru | Impreza | Outback |
| 2004-2014 | Subaru | Impreza | WRX STI |
| 2015 | Subaru | WRX STI | Base |
| 2015 | Subaru | WRX STI | Launch Edition |
| 2015 | Subaru | WRX STI | Limited |
| 2006-2007 | Subaru | Impreza | WRX Limited |
| 2010-2014 | Subaru | Impreza | WRX Limited |
| 2009-2014 | Subaru | Impreza | WRX Premium |
| 2007 | Subaru | Impreza | WRX STI Limited |
| 2011-2014 | Subaru | Impreza | WRX STI Limited |
| 2010 | Subaru | Impreza | WRX STI Special Edition |
| 2006-2007 | Subaru | Impreza | WRX TR |
Why Choose GSC Power-Division?
- Engineered by valvetrain specialists with rally and drag racing heritage
- Components tested to extreme boost levels in real-world Subaru builds
- Exact fitment with tolerances held to thousandths for OEM-like reliability
Frequently Asked Questions
- Q: Does this fit 2004-2007 Subaru STI EJ257 heads?
A: Yes covers all EJ turbo DOHC including 2004-2015 STI models with .440″ max lift compatibility - Q: What materials are used in construction?
A: Premium Swift chrome silicon valve springs paired with lightweight titanium retainers for strength and reduced mass - Q: What warranty coverage is provided?
A: Lifetime warranty on valve springs against sag or failure when installed correctly
Shipping & Handling
- Method: UPS or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Sturdy box 12 x 8 x 4 inches
- Weight: 5.0 lbs
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