SKU: 26180 | UPC: 807298044972
Manley Subaru WRX/STi Valve Spring and Retainer Kit (w/o Valve Locks) (16 each) 2002-2021
Manley Performance Valve Spring and Retainer Kit (26180) equips 2002-2021 Subaru Impreza WRX and WRX STI models with EJ20 and EJ25 DOHC engines for race-level valvetrain reliability. Chrome-silicon alloy springs combine with titanium retainers to resist fatigue and deliver exact valve control at high RPMs in racing applications. This kit pairs with aggressive aftermarket camshafts to ensure stability and longevity under extreme turbocharged conditions over 30 PSI boost.
Key Features
- Chrome-Silicon Alloy Springs: High-tensile strength and fatigue resistance support performance beyond 9000 RPM
- Titanium Retainers: Lightweight 6AL4V titanium construction cuts valvetrain mass for quicker valve action and reduced stress
- 16-Piece Kit: Full set includes 16 springs and 16 retainers for complete intake and exhaust valvetrain coverage
- Precision Engineering: Matched spring rates and dimensions ensure compatibility with EJ20 EJ25 stock or performance cylinder heads
- High-RPM Stability: Prevents valve float in turbocharged EJ engines with boost exceeding 30 PSI
Product Notes
- Valve locks not included order OEM Subaru or compatible aftermarket separately
- Inspect springs for proper seating and preload during assembly
- Shipped in protective foam-lined box to prevent damage
Installation Notes
- Professional installation recommended.
- Measure installed spring height and coil bind to match camshaft specs
- Compatible with OEM valve locks and 11mm stem aftermarket valves
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX |
| 2005-2006 | Saab | 9-2X | Aero |
| 2008-2014 | Subaru | Impreza | WRX |
| 2015-2021 | Subaru | WRX | – |
| 2004-2009 | Subaru | Impreza | WRX STI |
| 2010-2014 | Subaru | Impreza | WRX STI |
| 2015-2021 | Subaru | WRX | STI |
Why Choose Manley?
- Decades of experience supplying valvetrain parts to professional race teams
- All components manufactured in USA with aerospace-grade materials
- Engineered and dyno-tested for Subaru EJ engines in real-world racing
Frequently Asked Questions
- Q: Will this kit fit 2015-2021 WRX STI EJ257 engines?
A: Yes fits all 2004-2021 STI models with 2.5L DOHC EJ257 including hatchback and sedan variants - Q: What materials are used in springs and retainers?
A: Springs made from chrome-silicon alloy retainers from 6AL4V titanium for strength and light weight - Q: What warranty covers this valvetrain kit?
A: Limited lifetime warranty on springs for fatigue failure when installed and used correctly
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Secure foam-lined cardboard box 12in x 10in x 6in
- Weight: 4.85 lbs
