The Forced Performance blue UHF turbocharger for Subaru STi and WRX applications is a 58mm CH7CM UHF unit with a ported turbine housing, internal wastegate, and oil feed line. The ported turbine housing note indicates modified flow passages compared with standard housings, while the internal WG keeps boost control within the housing. Use this ported-internal UHF variant when that configuration matches your Subaru setup.
Forced Performance Subaru STi/WRX Blue UHF Turbo 58mm CH7CM Trbn Hsg Ported Internal WG w/Oil Line