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Manley Performance Manley Subaru WRX/STI 16pc Valve Springs (1.050/.755) (for use with 23180-16 Retainers)
Manley Performance Manley Subaru WRX/STI 16pc Valve Springs (1.050/.755) (for use with 23180-16 Retainers)
Manley Performance Manley Subaru WRX/STI 16pc Valve Springs (1.050/.755) (for use with 23180-16 Retainers)
Manley Performance Manley Subaru WRX/STI 16pc Valve Springs (1.050/.755) (for use with 23180-16 Retainers)
Manley Performance Manley Subaru WRX/STI 16pc Valve Springs (1.050/.755) (for use with 23180-16 Retainers)
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Manley Subaru WRX/STI 16pc Valve Springs (1.050/.755) (for use with 23180-16 Retainers)

MAN22180-16
807298045375
Valve Springs, Retainers
20+ Units In Stock - Ships Next Business Day
$ 138.83 $ 131.89
$ 131.89

SKU: 22180-16 | UPC: 807298045375

Manley Subaru WRX/STI 16pc Valve Springs (1.050/.755) for 2002-2012 Impreza Models (Use with 23180-16 Retainers)

Manley 22180-16 valve springs deliver reliable valvetrain stability for Subaru EJ20 and EJ25 turbo engines in WRX and STI models. This 16-piece set (8 inner and 8 outer springs) fits 2002-2012 Impreza WRX/STI variants and 2005-2006 Saab 9-2X Aero. Engineered for high-RPM operation with stock or aftermarket cams up to 12.5mm lift these springs prevent valve float in demanding performance builds.

Key Features

  • Dimensions: 1.050" outer diameter and 0.755" inner diameter with 1.785" free height for precise fit in EJ cylinder heads
  • Spring Rates: 135 lbs seat pressure and 325 lbs open pressure at 0.450" lift to control valves under boost up to 35 psi
  • Material: Super clean chromoly steel alloy wound on computer-controlled machines heat treated stress relieved and shot peened for fatigue resistance over 500 million cycles
  • Coil Bind Height: 1.220" installed height ensures safe clearance with performance valvetrain components
  • Retainer Compatibility: Designed exclusively for Manley 23180-16 retainers to maintain geometry and prevent retainer-to-seal contact

Product Notes

  • Inspect valve seals and guides during installation to ensure proper spring sealing
  • Break-in requires 500 easy miles before aggressive driving to seat the springs
  • Ships in protective foam packaging to prevent coil damage

Installation Notes

  • Professional installation recommended.
  • Use a Subaru-specific valve spring compressor tool for EJ heads to avoid bending valves
  • Compatible with OEM or aftermarket titanium retainers 23180-16 torque to 7-9 ft-lbs

This Part Fits

Year Make Model Submodel
2005-2006 Saab 9-2X Aero
2002-2012 Subaru Impreza WRX
2006-2007,2010-2012 Subaru Impreza WRX Limited
2009-2012 Subaru Impreza WRX Premium
2004-2012 Subaru Impreza WRX STI
2007,2011-2012 Subaru Impreza WRX STI Limited
2010 Subaru Impreza WRX STI Special Edition
2006-2007 Subaru Impreza WRX TR

Why Choose Manley?

  • Over 40 years supplying valvetrain parts to professional race teams worldwide
  • All springs manufactured in Lakewood New Jersey USA with rigorous dyno testing
  • Proven in NHRA SCCA and rallycross on EJ-powered Subarus

Frequently Asked Questions

  • Q: Will these fit my 2008 Subaru Impreza WRX STI EJ257?
    A: Yes 22180-16 is direct replacement for OEM springs in all EJ25 turbo heads from 2004-2012 STI models maintaining stock height and geometry
  • Q: What material are the springs made from?
    A: Premium chromoly steel (CrSiV) with black oxide finish for corrosion resistance and optimal damping under high boost
  • Q: What is the warranty and install process?
    A: Lifetime warranty against spring failure when installed correctly. Requires head removal compressor tool and retainer match. check cam lobe specs first

Shipping & Handling

  • Method: UPS Ground or FedEx
  • Availability: In stock - ships same or next business day
  • Packaging: Foam-lined box 12 x 8 x 6 inches
  • Weight: 4.85 lbs

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