Borg Warner EFR 6258 Alu A/R 0,64 WG 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: B1 CHRA: Iron Compressor side Compressor housing inlet: 2,5" (63,5mm) Compressor housing outlet: 2" (50,8mm) Compressor wheel inducer: 49mm Compressor wheel exducer: 62mm Speed sensor port Turbine side Turbine housing inlet: T25 Turbine housing outlet: V-band Turbine wheel inducer: 58mm Turbine wheel exducer: 51mm A/R 0,64 Singel scroll Internal wastegate The turbine housing is made for Internal wastegate. Wastegate is selected separately from associated products.