Manley Subaru WRX/STi .490in Valve Spring and Retainer Kit (w/o Valve Locks) (16 each)

Manley Performance Valve spring and Retainer Kits take the guess work out of making your valvetrain race-ready. Engineered for maximum durability, stability, and precision in high-performance and racing applications, these chrome-silicon alloy springs provide exceptional fatigue resistance and high-tensile strength, ensuring consistent valve control at extreme RPMs. Save time and money with these kits, featuring premium springs, retainers, designed to handle aggressive aftermarket camshafts. Max Lift: 0.510" - Spring: 22185-16 - Titanium Retainer: 23185-16 Manley Sport Compatct Valve Spring and Retainer Kit

• Includes matched Valve Springs, Retainers, and Locks (if part number ends in "K"). Spring Locators included in some applications.
• Includes 7 Machined Valve Locks manufactured from the premium quality heat treated steel
• Heat treated aerospace grade titanium retainers CNC machined to exacting tolerances
• Designed to handle aftermarket camshafts and up to 10,000 RPM

Upgrade your Subaru Impreza WRX or STi with the Manley Performance Valve Spring and Retainer Kit designed for high-performance engines. Crafted from premium chrome-silicon alloy, these valve springs deliver exceptional fatigue resistance and high-tensile strength, ensuring reliable valve control at extreme RPMs. The kit includes matched valve springs, heat-treated aerospace-grade titanium retainers, and machined steel valve locks, providing a complete solution for racing and aggressive aftermarket camshaft setups. Designed to withstand engine speeds up to 10,000 RPM, these components help maximize engine performance and durability without unnecessary complexity or expense. Whether you're building a race engine or enhancing your daily driver, this kit offers the confidence of premium quality and precise engineering to meet demanding applications.

Features:

• Includes matched valve springs, retainers, and locks for a complete installation

• Constructed from chrome-silicon alloy for durability and fatigue resistance

• Titanium retainers CNC machined to exact tolerances for precise fit

• Designed to handle aftermarket camshafts and high RPMs up to 10,000 RPM

• Spring maximum lift: 0.510 inches for optimal valve control

Fitment:
Subaru Impreza WRX 2002
Subaru Impreza WRX 2003
Subaru Impreza WRX 2004
Subaru Impreza WRX 2005
Subaru Impreza WRX STI 2004
Subaru Impreza WRX STI 2005
Subaru Impreza WRX STI 2006
Subaru Impreza WRX STI 2007
Subaru Impreza WRX STI 2008
Subaru Impreza WRX STI 2009
Subaru Impreza WRX STI 2010
Subaru Impreza WRX STI 2011
Subaru Impreza WRX STI Limited 2007
Subaru Impreza WRX STI Limited 2011
Subaru Impreza WRX STI Special Edition 2010