Grimmspeed Boost Control Solenoid - Subaru FA20 [Aftermarket Turbo Application, Solenoid Only] - 057046An FA20 BCS for Aftermarket Turbos. 1 4in Barbed Fittings Matches the factory turbo and wastegate hose size 3 Port Solenoid Proprietary internal modifications prepare the solenoid for extreme conditions below the vehicle Plug n Play Wiring Connector Plugs directly into the factory wiring harness with no modification required Flexible Design for aftermarket turbo inlets No need to mount the solenoid elsewhere in the engine bay, increasing complexity