Borg Warner EFR 9280 Iron 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: Iron Compressor side Compressor housing inlet: 4,0" (101,6mm) Compressor housing outlet: 2,5" (63,5mm) Compressor wheel inducer: 74mm Compressor wheel exducer: 91mm Speed sensor port Turbine side Turbine wheel inducer: 80mm Turbine wheel exducer: 73mm This is a Supercore (Compressor housing and center part) Turbine housing and wastegate are purchased separately.