Korsh 3 Port MAC Solenoid Subaru WRX/STI (GD) / Forester XT (SG)

Korsh delivers precision boost control with the most complete and easy to use 3-Port Electronic Boost Solenoid for turbocharged Subarus.

Unlike the factory 2-port solenoid, the Korsh 3-Port MAC Solenoid enables extremely high resolution boost control, providing your tuner with the hardware needed to safely tune your vehicle with rock solid boost levels. This solenoid allows you to spool your turbo quicker and maintain tight control of boost throughout your entire power curve. Featuring a balanced valve design, it withstands up to 120psi without sacrificing even a single millisecond of response time.

Factory Fit and Finish

Korsh has engineered model-specific install brackets that allow you to mount this Boost Control Solenoid with OEM-quality fit and finish. The solenoid uses a Subaru wiring harness connector, so you simply unplug your factory solenoid and plug in the Korsh unit. No cutting, no splicing, no crimping OEM wires.

Industrial-Grade Engineering

The solenoid itself is built to commercial standards. MAC manufactures pneumatic control products for the largest industrial operations worldwide, where every minute of downtime can cost tens of thousands of dollars. Korsh worked closely with MAC engineers to design this unique valve, incorporating proprietary features that make it the most durable on the market. Special seals protect against moisture intrusion, while high-temp coils maintain response times at 6 milliseconds or less, even under extreme heat. Korsh has collaborated with leading tuners to ensure this solenoid works safely with the factory Subaru ECU.

Vehicle Fitment

• Subaru Impreza WRX (GD) 2001-2007
• Subaru Impreza WRX STI (GD) 2001-2007
• Subaru Forester XT (SG) 2003-2008

Key Features

• Decreased Spool Time: Flows 10% more than competing solutions
• Plug and Play: Direct connection to OEM harness — no wire splicing required
• Factory ECU Compatible: Custom coil designed to match Subaru ECU voltage
• Nickel Plated Fittings: Durable metal fittings, not fragile plastic
• 15-Minute Installation: Simple install with comprehensive written and video guides
• Balanced Valve Design: Handles up to 120psi with instant response
• High-Temp Coils: Maintains 6ms response time in extreme conditions
• Moisture Protection: Special seals for long-term reliability

What's in the Box

• 1 x Korsh 3-Port MAC Boost Control Solenoid
• 1 x Model-specific mounting bracket
• OEM-style plug-and-play wiring connector
• Vacuum hose and fittings
• Installation hardware