Cobb 08-12 Subaru WRX / 08-12 STI Hatch / 11-12 STI Sedan 3-Port Boost Control Solenoid

Part Details:

The COBB 3-Port Boost Control Solenoid for the 2008–2012 Subaru WRX, 2008–2012 STI Hatchback, and 2011–2012 STI Sedan is designed to deliver more accurate and consistent boost control than the factory 2-port solenoid. By increasing the ECU’s control authority over boost pressure, this upgrade improves turbo response and stabilizes boost delivery under load.

The 3-port configuration allows for finer boost targeting when paired with proper ECU calibration. It is commonly installed alongside intake upgrades, exhaust systems, intercooler upgrades, or turbo replacements to help eliminate boost spikes, fluctuations, and creep that can occur with the factory solenoid.

Key Features

• 3-port boost control design for enhanced boost precision
• Improved turbo response and stable pressure regulation
• Direct-fit application for supported Subaru WRX and STI models
• 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. Proper ECU tuning is required to safely recalibrate boost targets and maintain correct air-fuel ratios after installing a 3-port boost control solenoid.

Why upgrade from the factory 2-port solenoid?
The factory solenoid has limited boost control authority at higher boost levels. A 3-port design provides more precise regulation and improved consistency during tuning.

Can this be used with a stock turbo setup?
Yes. It is compatible with both stock and upgraded turbo systems when paired with appropriate 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.