MAZDASPEED 3-Port Boost Control Solenoid (BCS)

$ 115.00

Availability: Ships in 24 hours
Product Code: 771750

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CUSTOM TUNING REQUIRED!! Please contact your preferred Protuner in order to safely utilize this part!

The COBB 3-Port Boost Solenoid is an excellent upgrade for modern turbocharged vehicles, enabling precise boost control in a tidy package that is easy to install and tune. Our BCS will eliminate boost fluctuations inherent in OEM boost control systems, providing the necessary stable and repeatable boost control required for accurate tuning and consistent performance. The COBB BCS is equally capable of providing stable boost control at stock boost levels as well as extremely high boost levels associated with big-power builds, with an operating range of up to 120psi.

The COBB Tuning 3-Port BCS features 1/8" low-profile barb fittings to keep the unit compact, and are nickel coated for corrosion resistance. Optional 1/4" nickel plated fittings are also available separately. Viton spools and seals are used throughout for long life and lubricated with Dow Corning silicone grease. The manual override port is sealed with an O-ring, the wiring harness is sealed to the casing using a waterproof grommet and the solenoid wires are ultrasonically welded to the coil, making the device waterproof and safe to wash.

COBB Tuning has made the COBB 3-Port BCS installation as simple as possible. It mounts in the stock location and plugs directly into the stock wiring harness, making the physical install and electrical connection as straightforward possible. The BCS comes with a custom aluminum mounting bracket, stainless steel hardware, the necessary boost-line to complete all connections and zip-ties to route the boost-line neatly through the engine bay. The install instructions are easy to understand, with photographs and illustrations to guide you through the installation process, and include routing instructions for both internal and external wastegate configurations.

The COBB Tuning 3-Port BCS is the ultimate electronic boost control device for modern turbocharged applications, designed with outstanding boost control, engineered for consistent performance and extended service life, and configured for easy installation. Get your boost under control and Access the Potential of your turbocharged MAZDASPEED today!


The COBB 3-Port Boost Control Solenoid (BCS) adds the flexibility and precision needed for properly controlling boost via the factory ECU. Many upgrades to the turbocharging system (such as larger turbochargers and external wastegates) require the increased performance, reliability, flexibility, safety and installation options that the COBB 3-Port BCS provides.

MAZDASPEED 3-Port Boost Control Solenoid (BCS)
  • Accurate and Consistent Boost Control
  • Plug and Play 18-Gauge Wiring Harness
  • 1/8" Nickel Plated Barbed Fittings
  • Rated up to 120psi
  • Custom Aluminum BCS Mount

Customer Photos

MAZDASPEED 3-Port Boost Control Solenoid (BCS) is rated 4.9 out of 5 by 13.
Rated 5 out of 5 by from Awesome looking! This was an easy install with the Cobb Stage 2 kit. The look is awesome but sadly it cannot be seen too easily stuffed under all the tubing and controls. Compared to the stock unit this is 200% better built!
Date published: 2014-04-25
Rated 5 out of 5 by from Awesome! This boost controller is awesome defiantly worthwhile mod. Instantly notice better response. Boost feels quicker more controlled and consistent. My data log now shows flat smooth boost curve now.
Date published: 2015-08-10
Rated 5 out of 5 by from Great product Easy to install. Holds up the boost really good!!!!
Date published: 2016-01-19
Rated 5 out of 5 by from Well made and excellent performance You can never go wrong with purchasing and using top-of-the-line products. This piece is solid and performs PERFECTLY every time. It's also great to go into a tuner shop and have them see the pieces and be confident in the quality and performance.
Date published: 2015-11-18
Rated 5 out of 5 by from Awesome with my new turbo I needed this for my new turbo and it works flawlessly! I highly recommend it.
Date published: 2015-09-22
Rated 5 out of 5 by from Amazing little controller Hands down easiest install and instruction to follow. Not only that but boost levels became consistent every stinking time i buried the throttle. No more boost creep nice smooth transistion into boost. Make sure you get tuned for this thing though haha.
Date published: 2018-08-11
Rated 5 out of 5 by from Feel the power!!! Pretty easy install, you will definitely need to remove the inlet pipe for access to the turbo...took about an hour. I can definitely feel more power and better pull from about 4500rpm on. Definitely worth the money and time to install. I've been very happy with corksport and all the products I've purchased from them.
Date published: 2018-06-25
Rated 5 out of 5 by from Works like a charm! On the 3rd revision of my e-tune, and so far I'm very impressed with how dialed in the boost levels are. Logs look great and boost delivery is outstanding. Installation was a breeze - All of the necessary tubing and mounting hardware was included.
Date published: 2017-07-24
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