Tomioka Racing 3-Port Electronic Boost Solenoid - 2008-2021 Subaru STI

Tomioka Racing 3-Port Electronic Boost Solenoid - 2008-2021 Subaru STI

The Tomioka Racing 3-Port Electronic Boost Solenoid is a precision-engineered aftermarket replacement for the factory boost control solenoid on 2008-2021 Subaru STI models.

Precision Aftermarket Boost Solenoid for the 2008-2021 STI

The Tomioka Racing 3-Port Electronic Boost Solenoid is a precision-engineered aftermarket replacement for the factory boost control solenoid on 2008-2021 Subaru STI models. The solenoid delivers faster boost response and improved boost control consistency compared to the OEM unit, which ages and loses precision over time. Technical specifications: 12V DC operating voltage, 32 ohm coil resistance, IP67 waterproof rating.

Why Replace the Factory Solenoid

The factory boost control solenoid is an electronic valve that modulates boost pressure by controlling the wastegate actuator signal. Worn or aged solenoids produce inconsistent boost response, slow spool, and boost that wanders around the target. A new aftermarket solenoid with tight tolerances and fresh internals restores clean, consistent boost control -- particularly important on tuned cars where the ECU is working to hold a specific boost target.

Key Features

• Compatible with stock and aftermarket turbo systems
• Works with factory and aftermarket ECU tunes
• Compatible with E85 fuel systems
• Direct OEM replacement with significant performance improvements
• 20% higher flow rate compared to stock solenoids
• Faster boost response and reduced turbo lag
• Improved high-temperature stability for consistent performance

Fitment Notes

• Fits 2008-2021 Subaru STI

Straight From Subispeed

A recommended replacement on any 2008-2021 STI that has accumulated mileage, is experiencing boost fluctuation, or is being tuned for elevated boost targets. The Tomioka solenoid is a direct replacement at a competitive price point. On tuned cars this is a straightforward reliability and consistency improvement.

What's Included

• Tomioka Racing 3-Port electronic boost solenoid
• Wiring connector
• Mounting hardware

About Tomioka Racing

Tomioka Racing has been engineering bolt-on performance parts for Subaru platforms since 2007, with a design philosophy built around factory-style installation and real-world reliability. Every Tomioka Racing product is engineered to work with the factory setup -- clean installation, correct fitment, and durability under sustained use. For WRX, STI, BRZ, and the 86 platform, Tomioka Racing offers one of the most focused and thoroughly developed bolt-on catalogs available at this price point.