Cobb 04-07 Subaru STI / 02-07 WRX / 04-08 FXT 3-Port Boost Control Solenoid

Specifications   Part Details: The COBB 3-Port Boost Control Solenoid for the 2004–2007 Subaru STI, 2002–2007 WRX, and 2004–2008 Forester XT is designed to provide more precise and consistent boost control compared to the factory 2-port solenoid. By allowing the ECU to directly control boost pressure with greater accuracy, this upgrade supports improved turbo response and stable power delivery under load. This 3-port configuration allows for finer boost tuning adjustments when paired with proper ECU calibration. It is commonly installed alongside turbo upgrades, intake modifications, and custom tuning to optimize boost curves and reduce inconsistencies such as boost spikes or creep. Key Features 3-port boost control design for improved boost accuracy Enhanced turbo response and stable pressure regulation Direct-fit application for supported Subaru models Designed for use with proper ECU tuning calibration Supports higher boost levels compared to factory solenoid What’s Included COBB 3-port boost control solenoid Vehicle-specific mounting hardware Pre-assembled vacuum lines and fittings Installation instructions Frequently Asked Questions Is tuning required after installation? Yes. Proper ECU tuning is required when installing a 3-port boost control solenoid to ensure safe air-fuel ratios and correct boost targeting. What is the advantage over the factory solenoid? The factory 2-port solenoid has limited control authority at higher boost levels. A 3-port design provides more precise boost regulation and improved consistency. Is this compatible with stock turbo setups? Yes. It can be used on stock or upgraded turbo systems, provided appropriate tuning is performed. 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. Shipping   Shipping Options: WrenchMastersAuto.com ships your performance parts safely, quickly and conveniently nationwide via the most trusted shipping carriers such as: UPS, Fed Ex, USPS, and DHL.          Delivery Times: In Stock: 3-7 Business Days Custom Orders: 2-6 Weeks, Please Email: [email protected] or Call: 727-565-9808 for Questions. Enjoy FREE SHIPPING on most orders over $199! Contact WrenchMasters   Have Questions? Need Assistance? 727-565-9808 Our expert team members are available Mon-Friday 8:00 AM to 5:30 PM EST to provide support and answer any questions or concerns before or after your parts purchase. Part Installation Want your performance parts professionally installed? Save time, stress & hassle by scheduling your auto appointment online below. Our team of ASE certified master techs will make sure your parts are installed properly at our St.Petersburg, Florida shop location. Schedule Install Now Performance Parts Locator Looking for a specific part not listed on our online store? WrenchMastersAuto.com has access to over 40,000 aftermarket performance parts for vehicles of all makes and models, old and new.  Fill out the parts request form below, and our parts specialist will contact you within 24-48 hours.