TUNING REQUIRED!! Please download the appropriate Off The Shelf Map for your vehicle or contact your Protuner in order to safely utilize this part!

Fitment Information

• Subaru WRX Sedan / Wagon (2002, 2003, 2004, 2005, 2006, 2007)
• Subaru WRX STI Sedan (2004, 2005, 2006, 2007)
  • Fits Both Manual and Automatic Transmission

Emissions Compliance

• 50 State Legal - This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the manufacturer's application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number: D-660-261

Specs & Features

• Total Boost Control: Replaces the sloppy factory 2-port bleeder system with a fast-acting 3-Port Design, allowing for precise, unwavering boost curves even on high-horsepower builds.
• Plug-and-Play Install: Features a custom 18-Gauge Wiring Harness that plugs directly into your factory loom and a custom aluminum mount that fits the stock location—no cutting or splicing required.
• Built for Abuse: Rated to handle up to 120psi of pressure, utilizing industrial-grade Viton seals and ultrasonically welded wiring to be fully waterproof and corrosion-resistant.
• Leak-Free Fittings: Equipped with 1/8" Nickel-Plated Barbed Fittings that grip your vacuum lines tight, preventing dangerous boost leaks under load.
• Tuning Essential: The critical hardware component needed to safely run higher boost levels, external wastegates, or aggressive tunes without experiencing "boost creep" or spikes.

Product Description

The factory boost control system on your Subaru is designed for "smoothness" and low power, not performance. It uses a "bleed" method that reacts slowly, often leading to boost spikes, tapering, or just inconsistent power pull-to-pull. The COBB Tuning 3-Port BCS is the hardware fix that puts the ECU in total control. By interrupting the pressure signal to the wastegate (rather than bleeding it off), this solenoid allows your tuner to target a specific boost number and hit it exactly, every single time.

If you are upgrading your turbo, adding an external wastegate, or just tuning for more power on the stock snail, the stock solenoid can't keep up. The COBB 3-Port is fast-acting and robust. It eliminates the "fluctuations" inherent in the OEM system. Whether you are aiming for a rock-solid 18psi on a daily driver or pushing 30psi+ on a track build, this solenoid ensures your wastegate opens exactly when it's supposed to—and not a second sooner.

COBB Tuning doesn't just sell parts; they sell peace of mind. This 3-Port BCS is widely considered a "mandatory" upgrade for modified Subarus because it safeguards your engine while unlocking its potential. Stop letting the factory computer guess at your boost levels. Install the COBB BCS, flash the map, and feel the difference of a car that pulls hard and smooth all the way to redline.