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

If you're rebuilding the top end of your 2002-2011 Subaru Impreza, especially if you're planning on aggressive aftermarket camshafts, this Manley Performance Valve Spring and Retainer Kit is a solid choice. This kit is built to handle the demands of high-performance engines, ensuring your valvetrain stays stable and controlled even at extreme RPMs, up to 10,000 RPM according to the manufacturer.

Manley uses chrome-silicon alloy for the springs, which offers excellent resistance to fatigue and high tensile strength. This means they'll maintain consistent pressure and control over the valves, even under the stress of racing or spirited driving. The kit includes heat-treated, aerospace-grade titanium retainers that are CNC machined for precise fitment, and the springs themselves are designed to work with aftermarket camshafts. This kit is specifically for the Subaru WRX and STI models from 2002 to 2011.

It's important to note that this specific part number, 26185, does not include valve locks. You'll need to source those separately. This kit is designed to take the guesswork out of selecting compatible valvetrain components for your performance build, ensuring you have well-matched parts for reliable operation.