The popular AirWerks S200SX-E Style compressor housing for the EFR turbochargers. BorgWarner EFR Compressor Housing - EFR-7163 - SX-E Style - 11711013004 High flow housing without BOV and stroke valve original BorgWarner EFR Compressor Cover AirWerks SX-E Style Again and again we got inquiries if there is a more compact compressor housing, such as the popular of the AirWerks S200SX-E turbo, also exist for the EFR turbocharger. Because it is smaller, it fits also on motors with little space and comes without integrated BOV port (which not everyone wants / can use) and without a solenoid. We now have the EFR-7163 AirWerks SX-E Style compressor housing (11711013004) from BorgWarner. For Turbocharger: EFR-7163 Outer diameter Compressor Cover inlet: 3.50" Outer diameter Compressor Cover outlet: 2" Optional: EFR speed sensor port Connection Pressure: Dash 4 The compressor cover is more compact than the original EFR compressor cover because no BOV channel is included.