TurboXS Electronic Boost Control Solenoid 2008-2021 STI
Here, you are looking at the TurboXS 2008-2021 Subaru STI Boost Control Solenoid.
This item is designed to replace the factory 2 port boost solenoid with a 3 port. This part is required for proper boost control on your WRX when using an aftermarket Downpipe or Upgraded Turbocharger.