Grimmspeed 3 Port Electronic Boost Control Solenoid Only

2015-2020 Subaru WRX

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SKU: 057046We price match!

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If you are running an aftermarket turbo setup on your 2015-2020 Subaru WRX, then you need this Grimmspeed 3 Port Electronic Boost Solenoid from Subispeed! NOTE: This product is not for use with the stock 2015 WRX turbo or other stock replacement turbochargers. This solenoid is for aftermarket turbo kits and as such, does not include the required adaptor for the stock FA20 turbo inlet.
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  • 1/4in Barbed Fittings - Matches the factory turbo and wastegate hose size.
  • 3-Port Solenoid - Proprietary internal modifications prepare the solenoid for extreme conditions below the vehicle.
  • Plug-n-Play Wiring Connector - Plugs directly into the factory wiring harness with no modification required.
  • Flexible Design for aftermarket turbo inlets - No need to mount the solenoid elsewhere in the engine bay, increasing complexity and hose length.

A Must Have Improvement for an Aftermarket Turbo Setup

If you've been in the Subaru game for long, you're probably well aware that a 3-port Boost Control Solenoid (BCS) is considered my most to be a 'must have' improvement before having your car tuned. GrimmSpeed has become the trusted brand in the BCS market, with tens of thousands of solenoids in operation today across the globe.

The 2015 WRX offers a unique change of pace, as the factory 2-port solenoid is mounted directly to the plastic turbo inlet and interfaces with an o-ringed feature, rather than a vacuum hose, but, if you're running an aftermarket turbo setup, you may no longer be utilizing the factory turbo inlet. This product includes the solenoid with fittings and connector, as well as a universal mounting bracket, rather than the machined adaptor required by the factory turbo inlet. We've also left the wiring harness longer to facilitate a number of different mounting locations, depending on your turbo setup.

The Advantage of the 3 Port

The advantages of a 3-port boost control system vs. the factory 2-port system are readily apparent during the tuning process. The 3-port systems works by interrupting the boost signal traveling from the turbo to the wastegate. That boost is redirected back into the turbo inlet and re-ingested by the turbo using our machined adapter. This is important, as the factory Mass Airflow Sensor has already measured that air and is expecting that your motor will use it during combustion, rather than venting it to the atmosphere. The factory configuration simply 'bleeds' the signal from between the turbo and wastegate, which creates a system that is a bit less complex, but reacts more slowly and with less precision. The chart above shows two boost plots. The 'before' is our 2015 WRX, dyno tuned by a third party protuner. The 'after' is the exact same tune, but after the installation of the GrimmSpeed 3-Port BCS. As you can see, the addition of the GrimmSpeed BCS shows much tighter boost control and consistency. This is safer for your car and easier for your tuner.


  • 2015-2020 Subaru WRX

2 customer reviews

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(based on 2 reviews)
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  1. Good buy

    By Lee October 1, 2022

    Great bolt on - recommend doing it if doing other mods that would require a tune. This allows your tuner to have better control

  2. Highly recommended

    By Chad August 3, 2018

    By far the best EBCS on the market.

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