300-550hp: This turbocharger comes with aluminum bearing house and steel cast Twin Scroll turbine house with integrated wastegate. As well the turbo boost control valve is included. In addition to the ceramic bearing this turbo this turbo is equipped with Mixed flow Turbine wheel in Titanium Aluminum material. All these anti turbo lag features keeps the spool up time to a minimum. Compressor wheel diameter: 71mm Turbine wheel diameter: 63mm A/R: 0.80. The picture serves as an example.