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COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
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COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid (Part Number: )
COBB Tuning 3-Port Boost Control Solenoid
Subaru WRX/STi 2002-2007 / Forester XT 2004-2008
Read 25 Reviews | 29 Q&As
Part # 712750

In stock! Ships same day

Features & Product Details

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. This BCS will eliminate boost fluctuations and boost creep 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.


Brand: COBB Tuning
Adjustable: Yes
Color: Blue
Number of Ports: 3
OEM Replacement: Yes
QTY: 1
Tuning Required: Yes
Mfgr. Warranty: 1 Year
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
RallySport Guarantee
WARNING: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.



25 Reviews
4.9 out of 5 Stars
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Customer Photos and Videos
COBB Tuning 3-Port Boost Control Solenoid ( Part Number: 712750)
COBB Tuning 3-Port Boost Control Solenoid ( Part Number: 712750)
Boost Control Solenoid 6 months ago
A must have.
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Necessary in place of analog actuator.  9 months ago
Huge difference over stock. Boost comes on earlier and smoother. While the Cobb OTS tune works, I wouldn't run it for long without a custom tune. I saw small knock events with regularity until I switching to custom. Stage 1+EBCS felt equivalent to Stage 2 w/stock boost controller dyno tune to my butt. Very easy to install.
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Love this ebcs, BUT 12 months ago
Originally purchased this ebcs back in january of 2016 for a motor build. Got it tuned and it ran flawlessly for 19 months of daily driving, approximately 23,000 miles. Buttery smooth boost delivery even with a larger turbo. Out of the blue it died completely and it sent me down the troubleshooting black hole. Car would only make about 6lbs of boost with a bpt 20g, no CEL or any other obvious issues. Eventually figured out the ebcs was dead and popped in a new one. All boost issues were resolved and I'm back to normal. Sucks that the warranty on this ebcs is only one year from cobb, but after a lot of searching on forums I could not find a single thread that mentioned a failed aftermarket ebcs. That being said I am sure that I am one of the very few that have run into one failing.
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1 of 1 people found the following review helpful
Great Supporting Mod When Ready for More HP! 1 year ago
My Stage 2 WRX seemed to perform much smoother after switching my OTS Map from the Cobb Stage 2 over to the Cobb Stage 2 + EBCS. I noticed a smoother power band. This mod will also become very crucial when getting a ProTune in the near future. I would highly recommend. I also made an install video on my YouTube Channel: 06WRXDUDE
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Lag killer in my 07WRX 2 years ago
This was the best upgrade per dollar yet from Cobb. It greatly reduced turbo lag. The OTS map worked perfectly with it.
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  • Q: Evo X  heathreyes334 months ago

    I have a basically stock 2008 Evo x gsr. If I install this EBCS, will I need a pro tune?
  • Q: 08 WRX  Josner4 months ago

    I currently have a pro-tune from JR Tune @ Prime Motoring in Carlstadt, NJ. Would I need a re-tune if I install this Cobb EBCS
  • Q: BCS  dustinpazzin35 months ago

    I have a 2006 subaru legacy gt 2.5L with a 2004 jdm wrx engine swap, current mods are: Cobb sf intake, Cobb V3 accessport and nameless muffler deletes. Can i plug the boost controller in and tune it through my accessport? or will i need to get a pro tune? thanks
    • 0 of 0 people found the following answer helpful

      A:  Cobb does offer OTS maps for the EBCS for your vehicle, however, with the motor swap you'll definitely want to get a pro tune, since the OTS map is meant for the original EJ255 motor.

      Marcus E. @ RallySport Direct 5 months ago  
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  • Q: Car problems  fliproden19826 months ago

    I already have the Cobb 3 port boost control driving down the road my check engine light comes on along with traction control light and a flashing cruise control the code comes up waistgate control solenoid so if I buy a new one do I have to get a retune