Cobb 08-12 Mitsubishi EVO X / 09-12 Ralliart 3-Port Boost Control Solenoid

Part Details:

The COBB 3-Port Boost Control Solenoid for the 2008–2012 Mitsubishi EVO X and 2009–2012 Ralliart is engineered to provide improved boost accuracy and control compared to the factory 2-port system. By increasing the ECU’s authority over boost regulation, this upgrade delivers more consistent turbo response and stable pressure management under load.

The 3-port design allows for finer boost targeting when paired with proper ECU calibration. It is commonly installed alongside intake upgrades, exhaust modifications, turbo upgrades, and custom tuning to help eliminate boost fluctuations, spikes, and creep often seen with stock boost control components.

Key Features

• 3-port solenoid design for enhanced boost control precision
• Improved turbo response and boost consistency
• Direct-fit application for EVO X and Ralliart models
• Supports higher and more stable boost levels than factory solenoid
• Designed for use with proper ECU 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?
Yes. Installing a 3-port boost control solenoid requires updated ECU calibration to safely control boost pressure and maintain proper air-fuel ratios.

What benefits does a 3-port solenoid provide?
A 3-port design offers greater control authority over boost pressure, improving consistency and allowing more precise boost targeting during tuning.

Can this be used with a stock turbo?
Yes. It is compatible with both stock and upgraded turbo systems when properly tuned.

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.