Universal Vacuum Control Turbocharger Turbo Systems M57UVA/2268BB for BMW M57 Stage 3 - M57UVA/3073BB - BMW M57 Universal Vacuum Control Turbocharger This is our custom ball bearing solution for other M57 engines designed to work with 170KW/231HP exhaust manifold. Instead of electrical actuator vacuum control is used. Specifications Stage 1 (HTD2268BB): dual ceramic ball bearing; CNC machined compressor housing; CNC machined turbine housing; OEM variable geometry nozzle; reinforced machined from the solid compressor wheel - 46/68mm; turbine wheel - 50,5/45mm; Flow bench adjusted; Balanced on VSR; Power range: up to 300HP Stage 2 (HTD2872BB): dual ceramic ball bearing; CNC machined compressor housing; CNC machined turbine housing; OEM variable geometry nozzle; reinforced machined from the solid compressor wheel - 50/72mm; turbine wheel - 51/49mm; Flow bench adjusted; Balanced on VSR; Power range: up to 400HP Stage 3  (HTD3073BB): dual ceramic ball bearing; CNC machined compressor housing; CNC machined turbine housing; Custom variable geometry nozzle; reinforced machined from the solid compressor wheel - 54/73mm; turbine wheel - 58/54mm; Flow bench adjusted; Balanced on VSR; Power range: 420+HP Stage 4 (HTD3279BB): Big dual ceramic ball bearing; Enlarged shaft (6mm diameter ) and turbine wheel; CNC machined compressor housing; CNC machined turbine housing; Custom variable geometry nozzle; Reinforced machined from the solid compressor wheel - 56/79mm; High flow design turbine wheel - 58/56mm; Flow bench adjusted; Balanced on VSR; Power range: 470+HP Stage 5 (HTD3379BB): Big dual ceramic ball bearing; Enlarged shaft and wheel diameter 7mm; CNC machined compressor housing; CNC machined turbine housing; NEW design custom variable geometry nozzle with 14 nozzle blades; reinforced machined from the solid compressor wheel - 56/79mm; High flow design turbine wheel - 62.8/56mm; Flow bench adjusted; Balanced on VSR; Power range: 500+HP