The Forced Performance 58mm turbo for Subaru STi/WRX is a driver's-side unit with a blue compressor cover, black turbine housing and an external wastegate connection plus an oil line. Specified for STi/WRX applications, the description notes the 58mm compressor size, external WG arrangement and required oil feed, clarifying this turbo is intended for the driver's-side position.
Forced Performance Subaru STi/WRX Blue Turbo 58mm Black Turbine Hsg External WG w/Oil Line(D/S Only)