Grimmspeed 3-Port Electronic Boost Control Solenoid 2006-2007 WRX / 2004-2007 STI / 2004-2008 Forester XT / 2004-2006 Baja XT

GrimmSpeed is proud to offer the most complete, tuner-friendly 3-Port Electronic Boost Control Solenoid available for turbocharged Subaru models. Unlike the factory 2-port unit, this 3-port design provides extremely high-resolution boost control, giving your tuner the precision needed to dial in quicker spool, stable boost pressure, and consistent performance across the entire powerband. Thanks to its balanced valve design, this solenoid withstands up to 120psi without sacrificing response time—even for a single millisecond.

Quick Specs

• Faster Spool: Flows 10% more than competing units
• Direct Plug-and-Play: Uses OEM-style harness—no wire cutting
• ECU-Safe: Custom coil designed to match Subaru ECU voltage
• Durable Hardware: Nickel-plated metal fittings, not fragile plastic
• Easy Install: Approximately 15 minutes with included guides

Design:

Grimmspeed redefined the Subaru boost solenoid market by engineering model-specific brackets that provide a true factory-fit installation. The solenoid also utilizes an OEM-style Subaru electrical connector, allowing you to unplug the stock solenoid and plug ours in—no splicing, no crimping, no headaches.

The solenoid unit itself is exclusive to GrimmSpeed and developed in partnership with MAC, a global leader in high-reliability pneumatic control systems. Using proprietary internal sealing and a high-temperature coil, our valve maintains lightning-fast 6ms response times even in extreme under-hood conditions. We collaborated with top Subaru tuners to ensure full compatibility and safe operation with factory Subaru ECUs.

Materials:

Every component in this kit is built to withstand the heat and vibration of a Subaru engine bay.

• Rugged, moisture-resistant solenoid body
• Laser-cut, black zinc-plated mounting brackets with pressed-in threaded PEM nuts
• OEM-grade Subaru harness connectors with weather-sealed terminals crimped using DELPHI tooling
• Low-profile 1/8" NPT nickel-plated fittings installed with 120psi-rated thread sealant for a clean, secure, leak-free setup

Installation Guide