Turbine housing 0,63 A/R

T4 Single A/R 0,72 

T3 twin scroll A/R 0,84

T4 twin scroll A/R 1,15 

Compressor housing o'ring

Turbine housing 0.63 A/R (01)

T4 single entry flange

Turbine housing 1.07 A/R (02)

T4 twin entry flange