Borg Warner EFR 8374 Alu Supercore Borg Warner EFR is a compact series of turbochargers for motorsport and tuned engines where both wastegate, relief valve and boost valve are integrated. The EFR series is the choice if you want the best turbochargers. Frame size: B2 CHRA: Aluminum, lightweight Compressor side Compressor housing inlet: 4,0" (101,6mm) Compressor housing outlet: 2,5" (63,5mm) Compressor wheel inducer: 62mm Compressor wheel exducer: 84mm Speed sensor port Turbine side Turbine wheel inducer: 74mm Turbine wheel exducer: 65mm This is a Supercore (Compressor housing and center part) Turbine housing and wastegate are purchased separately.