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The TurboXS boost control solenoid for 2015–2021 Subaru WRX (FA20) replaces the factory two‑port solenoid with a three‑port unit to improve boost control when running an aftermarket front pipe. Offered as a direct replacement, it enables more consistent boost management and is a recommended upgrade for WRX owners installing non‑stock front piping to retain precise boost regulation.
Turbo XS 15-21 Subaru WRX FA20 Boost Control Solenoid Kit
