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+ 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 inset diagram for how to plumb the vacuum lines.