Skip to content
🔥 Shop the "BRING THE HEAT" Sale 🔥
🔥 Shop the "BRING THE HEAT" Sale 🔥

Grimmspeed 3-Port Electronic Boost Control Solenoid 2008-2021 STI

SKU 057007
Original price $129.00 - Original price $129.00
Original price
$129.00 - $129.00
Current price $129.00

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.

Revolutionizing the Subaru boost solenoid market, we have created model specific install brackets that allow you to install our Boost Control Solenoid with a factory fit and finish. To top it all off, our solenoid also uses a Subaru wiring harness connector so that you can simply unplug your OEM solenoid and plug ours in. No more cutting and crimping OEM wires together!

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.

Quick Specs: 

  • 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

Customer Reviews

Based on 3 reviews
John dunn
Boost controller

One of the essential parts to making power. Tons of online support for different mounting and routing options.


The Grimmspeed EBCS is one of the top-selling mods you can purchase for your STI! It is a direct bolt on mod that provides faster response and greater flow! With proper tuning, you couldn't ask for a better mod! Thank you for your 5 Stars!


Naiyel Jules
Excellent product by Grimmspeed

It is a great product, it was super easy to install it took about an hour to do it, but I am glad it is done and I got the Grimmspeed cover to go along with it!


The Grimmspeed Electronic Boost Control Solenoid is an iconic EBCS for the STI! It helps spool your turbo quicker and a solid boost level! It is also a plug and play mod that once everything is out of the way is easy to install! Definitely one of the best installs you can make! Thank you for your 5 Star Review!


Jorge Coblentz

Great boost controller and easy to install.

A 3-Port Boost Controller is one of the most important mods you can install in your STI! Grimmspeed is one of the leaders in the industry and with tune their boost control solenoid is a substantial improvement over stock! It is a simple plug and play installation that can provide some of the most potential to your vehicle! Thank you for your 5 Star Review!


Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare