BorgWaner Airwerks S1BG Turbo - 313297 S1BG Turbo BorgWarner AirWerks S1BG Turbo - 58/53 BW part number 313297 Genuine BorgWarner AirWerks turbocharger AirWerks turbochargers from BorgWarner Turbo Systems are dedicated aftermarket turbos for the performance sector. Proven line-produced parts (mostly from Schwitzer Turbo) are being combined to deliver high end tuning and motorsports performance while maintaining an ideal price/performance ratio. performance rating: 120 - 320 HP compressor housing: intake 60mm / pressure side 50mm compressor wheel: inducer 43,28mm / exducer 57,96mm turbine housing: 0.61 AR / header flange T25 / turbine outlet BorgWarner 6-bolt turbine wheel: inducer 52,92mm / exducer 45,73mm / internal wastegate   - dual hydrodynamic journal bearing - internal wastegate - adjustable orientation of compressor housing and turbine housing Different A/R ratio? If you order an AirWerks turbocharger and wish to have a different AR you have to order the corresponding turbine housing separately.