Grimmspeed 3 Port Boost Control SolenoidIf you've been in the Subaru game for long, you're probably well aware that a 3 port Boost Control Solenoid (BCS) is considered my most to be a 'must have' improvement before having your car tuned. GrimmSpeed has become the trusted brand in the BCS market, with tens of thousands of solenoids in operation today across the globe. The 2015 WRX offers a unique change of pace, as the factory 2 port solenoid is mounted directly to the plastic turbo inlet
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