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

$ 115.00
Availability: BACKORDER :: Ships in 1 - 7 Days
Product Code: 712750


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

Subaru WRX / STI / FXT 3-Port Boost Control Solenoid (BCS) is rated 4.9167 out of 5 by 12.
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 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
Rated 5 out of 5 by from Seeing results I have the V3 access port already so I though I'd buy and install this solenoid, have seen difference in the boost. Have a feeling that there's more to come as maybe my ECU is still learning the COBB map I flashed after I installed the solenoid. Was hitting a constant 12-13 PSI , but hit 15 PSI the other day. New turbo next! Thanks COBB!
Date published: 2015-10-10
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 Big improvement over factory unit Boost kicks in sooner and boost consistently increases/decreases are very linear instead of the jerkiness and somewhat unpredictability of the factory unit. Note- ECU relearning takes a while after a reflash- took almost a month for my DAM to get back to 16 after the reflash.
Date published: 2014-10-25
Rated 5 out of 5 by from EBC awsome With the EBC installed (super easy) and Cobb's stage 2 ebc map flashed my car drives awsomes. No more boost fluctuations or spikes, hold right on point. Thanks Cobb for yet another great product, well worth the money.
Date published: 2015-07-05
  • 2015-12-01T06:55CST
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