Mach V 3-Port Boost Control Solenoid 2002-2014 WRX, 2004-2021 STI

Our three-port boost solenoid provides the fastest spool and rock-solid boost control. Installation is a snap, because it comes with a direct plug-and-play wiring harness. Fits all 2002-2014 WRX and STI models. Fits Legacy GT and Forester XT, too!

Note that this solenoid WILL require tuning of your boost control duty cycles. Do not bolt this on unless you have a programmable engine management system of some sort, and the ability to tune or have it tuned for you.

See the diagram for how to plumb the vacuum lines.

Fits all 2002-2014 Subaru WRX, and all 2004-2021 WRX STI.