The BorgWarner EFR B1 turbine housing fits 63mm EFR turbochargers, built in a 0.85 A/R with a V-band turbine inlet and V-band outlet flange (VOF). This is a free-float, non-wastegated (Non-WG) housing. Cast from stainless steel for high exhaust-gas temperature capability and durability on the street or track, it bolts to the EFR center section to complete the turbine side.
| Series | EFR B1 |
| Turbine Wheel | 63mm |
| Turbine Inlet | V-Band (VOF outlet) |
| A/R | 0.85 |
| Design | Single-scroll, free-float |
| Wastegate | None (non-wastegated) |
| Material | Stainless steel |
| Part Number | 11631008003 |
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