Cobb 15-17 Subaru WRX 3-Port Boost Control Solenoid

Part Details:

The COBB 3-Port Boost Control Solenoid for the 2015–2017 Subaru WRX is engineered to provide more precise and consistent boost regulation compared to the factory 2-port system. By increasing the ECU’s control authority over boost pressure, this upgrade delivers improved turbo response and stable boost delivery across the rev range.

The 3-port design allows for finer boost targeting when paired with proper ECU calibration. It is commonly installed alongside intake systems, intercooler upgrades, turbo modifications, and custom tuning on FA20DIT platforms to help eliminate boost spikes, fluctuations, and creep.

Key Features

• 3-port boost control design for improved boost precision
• Enhanced turbo response and boost stability
• Direct-fit application for 2015–2017 Subaru WRX (FA20DIT)
• Supports higher and more consistent boost levels than OEM solenoid
• Engineered for use with proper ECU tuning calibration

What’s Included

• COBB 3-port boost control solenoid
• Vehicle-specific mounting hardware
• Pre-configured vacuum lines and fittings
• Installation instructions

Frequently Asked Questions

Is ECU tuning required after installation?
Yes. Installing a 3-port boost control solenoid requires updated ECU calibration to safely manage boost targets and maintain proper air-fuel ratios.

What are the benefits over the factory solenoid?
The factory 2-port solenoid has limited boost control authority. A 3-port design allows more accurate boost targeting and improved consistency during tuning.

Is this compatible with stock turbo setups?
Yes. It can be used with stock or upgraded turbo systems when paired with proper tuning.

Recommended Supporting Forced Induction Components

• Blow Off Valves – help manage excess boost pressure and protect the turbo system under load.
• Intercooler Kits – reduce intake air temperatures and support consistent boost performance.
• Turbochargers – pair with precise boost control for optimized airflow and power output.
• Wastegates – regulate boost pressure and maintain stable turbo system operation.
• COBB Tuning Performance Products – explore additional tuning and turbo system upgrades from COBB.
• Subaru WRX Performance Parts – browse compatible upgrades for WRX turbo platforms.
• Subaru STI Performance Parts – discover supporting turbo components for STI builds.
• Subaru Forester XT Performance Parts – find boost control and turbo system upgrades for Forester XT models.