The BorgWarner AirWerks turbine housing for SX S400 with A/R .90 is the specified turbine-side exhaust housing for S400-series turbochargers. It offers the A/R .90 turbine geometry listed in the description and is intended for use with compatible AirWerks S400 components when assembling or reconfiguring a turbocharger to the noted A/R specification.
BorgWarner Turbine Housing SX S400 A/R .90