Grimmspeed 3-Port Electronic Boost Control Solenoid 2002-2005 WRX

GrimmSpeed proudly offers the most complete and user-friendly 3-Port Electronic Boost Solenoid for turbo Subarus. Unlike the OEM 2-port solenoid, our BCS provides high-resolution boost control, giving your tuner the hardware needed to safely and reliably manage boost levels. With our solenoid, your turbo spools faster and maintains precise boost control across the entire power curve. Featuring a balanced valve capable of withstanding up to 120psi, our solenoid responds instantly without lag, even under extreme conditions.

Quick Specs

• Decrease Spool Time – Flows 10% more than competing solenoids
• Plug-and-Play – Directly connects to OEM harness; no wire splicing required
• Factory ECU Safe – Custom coil matched to Subaru ECU voltage
• Nickel-Plated Fittings – Durable, break-resistant design
• 15-Minute Installation – Simple with included written and video guides

Design & Engineering

GrimmSpeed revolutionized Subaru boost solenoids with model-specific brackets for factory-fit installation. The solenoid connects via the OEM wiring harness for a seamless plug-and-play experience—no cutting or crimping necessary.

The solenoid itself is built in collaboration with MAC, a leader in industrial pneumatic control products. Proprietary features include:

• High-temp coil for consistent <6ms response, even under extreme heat
• Moisture-resistant seals for durability in harsh environments
• Tested and validated with top tuners to work safely with factory Subaru ECUs

Materials & Construction

• Laser-cut, black zinc-plated brackets for corrosion resistance
• Threaded PEM nuts for secure, stripped-thread-free installation
• Low-profile 1/8" NPT nickel-plated fittings installed with 120psi thread sealant
• Weatherproof Subaru harness connectors, crimped using DELPHI equipment

Installation Instructions