Turbine Housing TypeSelectt4, 1.25 a/r, twin scroll turbine housing (supports 83mm turbine wheel)t4, 1.10 a/r, twin scroll turbine housing (supports 83mm turbine wheel)t4, 1.00 a/r, twin scroll turbine housing (supports 83mm turbine wheel)t4, 0.92 a/r, twin scroll turbine housing (supports 83mm turbine wheel)