Borg Warner EFR 7064 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: 3,5" (88,9mm) Compressor housing outlet: 2" (50,8mm) Compressor wheel inducer: 52mm Compressor wheel exducer: 70mm Speed sensor port Turbine side Turbine wheel inducer: 64mm Turbine wheel exducer: 56mm This is a Supercore (Compressor housing and center part) Turbine housing and wastegate are purchased separately.