Forced Performance Green UHF turbo for Subaru STi offers an 84mm compressor in a black housing with an internal wastegate and oil feed, specified for driver-side installation only. The listing describes the larger 84mm sizing and internal WG layout for STi platforms where a driver-side turbo upgrade is required, without claiming additional fit or tuning changes.
Forced Performance Subaru STi Green UHF Turbo 84mm Black Housing Internal WG w/Oil Line (D/S Only)