Korsh 3 Port MAC Solenoid - Subaru STI 2008-2021

Korsh 3 Port MAC Solenoid – Subaru STI 2008–2021

Application: Subaru STI 2008–2021
Part Type: 3-port electronic boost control solenoid (MAC)
Part Number: KOR-3PS-08STI

Unlike the factory 2-port solenoid, the Korsh 3-port MAC solenoid gives extremely high resolution boost control, providing your tuner with the hardware needed to tune your STI safely with rock solid boost levels. It helps your turbo spool quicker and holds tight boost control across the entire power curve.

Model-specific install brackets give an OEM-quality fit and finish, and the Subaru wiring harness connector means you simply unplug the factory solenoid and plug in the Korsh unit – no cutting, splicing or crimping.

The valve is built to commercial standards with MAC, a maker of pneumatic controls for large industrial operations. Special seals protect against moisture, and high-temp coils hold response times at 6 milliseconds or less even under extreme heat.

Why Korsh?

• Decreased Spool Time – Flows 10% more than competing solutions.
• Plug and Play – Direct connection to the OEM harness, no wire splicing.
• 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 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 Included

• 1 x Korsh 3-port MAC boost control solenoid
• Model-specific install bracket

Important Notes

• Gives your tuner the hardware for high-resolution boost control – developed with leading tuners to work safely with the factory Subaru ECU.

Vehicle Fitment

• Subaru STI 2008–2021

Not sure if this suits your car? Email sales@coore.com.au and our team will confirm fitment.