GrimmSpeed 3-Port Electronic Boost Control Solenoid (BCS) – Turbo Subaru
The GrimmSpeed 3-Port Electronic Boost Control Solenoid is the original direct-fit boost control upgrade for turbo Subarus, designed to deliver faster spool, smoother boost curves, and far more precise boost control than the factory 2-port solenoid. By flowing more air and offering higher boost resolution, this solenoid gives your tuner the control needed to safely dial in consistent, rock-solid boost throughout the entire power band.
Unlike many universal options, the GrimmSpeed BCS is a true plug-and-play solution, featuring a model-specific mounting bracket and OEM-style harness connector meaning no wire cutting, splicing, or messy installation. Built in collaboration with MAC Valve engineers, this solenoid is engineered to withstand harsh engine bay heat and vibration, featuring moisture-resistant seals, high-temp coils, and lightning-fast response times of 6 milliseconds or less, even under extreme conditions. The balanced valve design supports up to 120 PSI without sacrificing performance.
This is one of the most trusted boost control upgrades in the Subaru world, with over 25,000 units in use across street builds and high-horsepower race cars alike.
Quick Specs
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Faster turbo spool and improved boost response
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Flows 10% more than competing boost solenoids
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Plug-and-play OEM harness connection (no splicing required)
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Custom coil designed to work safely with the factory Subaru ECU
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Durable nickel plated fittings (no fragile plastic fittings)
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Installs in about 15 minutes with included guides
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Balanced valve design rated to 120 PSI
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Response time of 6ms or less
Important Note
Tuning is required when upgrading to a 3-port boost control solenoid. Always consult your tuner before installation.