GrimmSpeed 3-Port Electronic Boost Control Solenoid | 2008-2021 Subaru STI (057007)

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Grimmspeed 3-Port Electronic Boost Controller for Subaru STI 2008-2018

GrimmSpeed is proud to provide the most complete and easy to use 3-Port Electronic Boost Solenoid for available for all turbo Subarus. Unlike your OEM 2-port solenoid, the GrimmSpeed BCS will allow for extremely high resolution boost control, providing your tuner with the hardware he needs to safely tune your car with rock solid boost levels. Using our solenoid, you are able to spool your turbo quicker and maintain tight control of boost levels throughout your power curve. In addition, our solenoid features a balanced valve to withstand up to 120psi without a slowing response by even a single millisecond.

Our special solenoid features, combined with our factory-fit brackets, ensure that this complete boost control solution will withstand the harsh heat and vibration of your engine bay. The Subaru harness connectors that we use include weatherproof terminal seals, carefully crimped with DELPHI equipment by our expert assembly staff. Mounting brackets are laser cut and then black zinc plated to ensure corrosion resistance. Each bracket has threaded PEM nuts pressed in for a solid connection with no risk of stripping threads. Each low profile 1/8" NPT nickel plated fitting is installed in the proper orientation using a 120psi thread sealant for a clean, compact, robust installation.

The solenoid itself is one of a kind. MAC manufactures pneumatic control products for the largest commercial operations in the world, where every minute of downtime can cost tens of thousands of dollars, so we worked closely with their engineers to design this unique valve, incorporating proprietary features, exclusive to GrimmSpeed, that make our solenoid the toughest on the market. Those features include special seals to protect it from moisture and high temp coils to keep response times at 6 milliseconds or less, even in extreme heat. We have worked with many of the top tuners in the country to ensure that our solenoid works safely with the factory Subaru ECU.


  • Decrease Spool Time - flows 10% more than the competition 
  • Plug and Play into OEM Harness - no splicing wires like other BCS solutions
  • Works Safely with Factory Subaru ECU - custom coil to match ECU voltage
  • Nickel Plated Fittings - not the easily breakable plastic fittings!
  • 15min Installation - extremely simple with our written and video guides

    Please Note:

    • Will require tuning after installation.


    • 2008-2021 Subaru STI

    What's in the box?

    • GrimmSpeed 3 Port Electronic Boost Control Solenoid
    • Hose



    Customer Reviews

    Based on 6 reviews
    Just what I needed

    My car was running a little rough. I got this product it was an easy install. Started running a lot smoother. A true must need for stage 1+ .

    Grimm speed boost controller

    Easy install

    Zachary Mccammon
    As expected

    Indicative of the great quality you'd expect of a grimmspeed product and top shelf service provided by maperformance

    10/10 works perfect

    Took an hour to install. Everything fits perfect. It’s a must on an ej!

    Edwin N.
    Great product!

    Easy to install, with detailed and accurate instructions.
    Solid boost control. Highly recommend by my tuner, Delicious Tuning!