Subaru WRX / STI / FXT 3-Port Boost Control Solenoid (BCS)

$ 115.00

Availability: BACKORDER :: Ships in 1 - 7 Days
Product Code: 712750

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TUNING REQUIRED!! Please download the appropriate Off The Shelf Map for your vehicle or contact your Protuner in order to safely utilize this part!

The COBB 3-Port Boost Solenoid (BCS) 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 the OEM boost control system, providing stable and repeatable boost control to base the vehicle's tune on. It is equally capable of providing this stable boost control at stock boost levels as well as extremely high boost levels associated with big-power builds.

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 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. The BCS is rated to operate up to 120psi.

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 simple as possible. The BCS comes with a custom aluminum mounting bracket, stainless steel hardware, boost-line to complete all connections and zip-ties to route the boost-line neatly through the engine bay. Installation Instructions are provided, are easy to understand, and provide routing instructions for both internal and external wastegate configurations.

The COBB Tuning 3-Port BCS is engineered to be 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 Subaru 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.

Subaru WRX / STI / FXT 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

Subaru WRX / STI / FXT 3-Port Boost Control Solenoid (BCS) is rated 4.7 out of 5 by 56.
Rated 5 out of 5 by from Best Upgrade For The Money, Period! I can't imagine a better way to spend $100. The install in my 02 WRX was less than graceful since some of the rubber lines had actually hardened and fused to the connection points. But I was patient and they eventually wiggled free. Once the old stuff was out it was simple with the instructions on the COBB tuning website. Overall it took about 20 min and was still the easiest install of anything I have done to date. After I was done I hooked my COBB AP to my laptop and downloaded the new map. The change was instantly obvious. A stronger and more consistent pull from launch to top speed. Hands down the best $100 I have spent on my car to date.
Date published: 2015-12-20
Rated 5 out of 5 by from easy install runs great with ots reflash Was chasing a power leak and wanted to replace stock 2 port on a 02 Wrx but didn't want to pay 500$+ for a protune since I have the v3 ap. Cobb just released +ebcs maps so I decided to try it out and I'm very pleased with the results. The loss was due to my timing being off but now that its fixed I can notice a big difference in the way my pressure is running and also my boost monitors are accurate down to the hundredth decimal. With the stock 2 port I could only monitor tenth decimal. Sounds better runs smoother and again a very easy install.... Only thing I'd change is they should include a photo diagram for people who might not know the difference between compressor nipple and turbo nipple
Date published: 2014-09-02
Rated 5 out of 5 by from Clean install and smooth opperation (fixed rough idle/misfire) I bought a 2003 WRX and for the first few months it ran rough at start up (while cold). Stuttering and idle issues. Codes for misfire on all 4 cylinders. Worked with the prior owner to troubleshoot. This car was open source tuned with a different manufacturers 3 port EBCS. I was wondering if the tune was possibly the issue as every other "fix" was tried. Installed this Cobb 3 port boost controller and loaded up the stage 2+ 91 tune from the website via the Cobb version 3 Accessport. Difference was immediate. Smooth idle, even at 40 degree Minnesota mornings, and NO misfires! Pretty much changed everything for the car. The EBCS works as advertised and the car runs incredible and smooth. Thanks Cobb!
Date published: 2015-10-30
Rated 5 out of 5 by from Boost controller mod is essential I just installed this boost controller today in the sub freezing weather and I can honestly say Im glad I did. This mod is in my opinion a must have for any subaru. Even on my first drive after reflash I noticed a huge difference in the snappy boost response right where you need it. This mod makes my stage 2 2007 wagon feel much faster and responsive. Thanks for the "off the shelf" tune Cobb!!!
Date published: 2015-01-10
Rated 5 out of 5 by from really good upgrade I bought this EBC to replace my old factory unit. Installation was simple and quick, it only took about 35min. After flashing the new map and letting the ECU re learn it self, the car felt amazing! Boost kicks in so much harder and faster than before. Cobb always deliver with there quality in there products.
Date published: 2014-09-05
Rated 5 out of 5 by from Just get it I bought this a week or two ago, and its been amazing. Before installing this, i would barely get 10lbs of boost in 3rd gear, and after installing it, im getting around 16 and the change was instant after flashing the new tune on my accessport. Great product, and fairly easy to install so long as your lines arent stuck to the connection points like mine were. Its very hard to get a zip tie on the compressor nipple because the tmic is in the way but ive gone without and have had no issues.
Date published: 2017-06-22
Rated 5 out of 5 by from Easy to install, better results than I expected. I noticed that I wasn't hitting peak boost or maintaining target boost or anywhere near it for that matter. After doing a little research I found that the OEM BCS's on subies are terrible so I decided to go with the Cobb unit. I have an AP anyway and flashed their stage 2 +EBCS map and it has made an incredible difference. Boost comes in faster and stays like it should. If anyone says Cobb's OTS maps aren't good, at least give them a shot, I was pleasantly surprised.
Date published: 2016-06-25
Rated 5 out of 5 by from Incredible difference over stock solenoid I got my boost solenoid about a week ago. I was having boosting issues before i bought this and i expected it to just fix the problem. It did more than that. I have a small increase in throttle response, when boosting its much more fluid and steady. I would recommend this product to someone looking for a boost solenoid and for people with small boosting issues. Overall I think this is a must have upgrade. Well worth the money and easy to install.
Date published: 2015-11-16
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