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The TurboXS boost control solenoid for 2008–2021 Subaru WRX STI replaces the factory two-port solenoid with a three-port unit to improve boost control. It’s intended for use when running an aftermarket downpipe or an upgraded turbocharger where enhanced regulation of boost is required. The solenoid provides a more appropriate port configuration for modified turbo systems.
Turbo XS 08-21 Subaru WRX STi Boost Control Solenoid Kit
