3-Port Electronic Boost Control Solenoid

The GrimmSpeed 3-Port Electronic Boost Control Solenoid is engineered as the original direct-fit solution for turbo Subarus, specifically designed for 2008-2021 STI models. It provides superior boost control capabilities compared to the OEM 2-port solenoid, allowing for high-resolution adjustments that enable tuners to achieve safe and stable boost levels. By utilizing this solenoid, drivers can experience quicker turbo spool and maintain precise boost control throughout their vehicle's power curve. Constructed with quality in mind, this boost control solenoid features a balanced valve capable of withstanding up to 120psi without compromising response time. The fittings are nickel-plated for durability, avoiding the easily breakable plastic found in other solutions. The design includes model-specific install brackets for a factory fit and finish. The solenoid itself is manufactured by MAC, a leader in pneumatic control products, and incorporates proprietary GrimmSpeed features, including special seals for moisture protection and high-temperature coils to ensure response times of 6 milliseconds or less, even in extreme engine bay heat. Mounting brackets are laser-cut, black zinc plated for corrosion resistance, and feature pressed-in PEM nuts for secure connections. Installation is designed to be straightforward, with an estimated time of 15 minutes, supported by written and video guides. As with any upgrade to the boost control system, a professional tune is required to optimize performance and ensure safe operation. The GrimmSpeed BCS has been widely adopted, with tens of thousands of units in use on high-performance Subarus worldwide, and is trusted by tuners for its performance and reliability.