Pulsar PSR Turbine Housing T4 1.25 A/R 87.1/81.4mm Turbine Wheel for 400 Series Turbo All housings come with an installation kit that includes: a stainless steel gasket for the inlet a clamp to connect the bearing housing P/N A/R Trb. Wheel Size Inlet Outlet Flange & Clamp Kit 600340006 0.9 83.6*74.3mm T4 Divided V-Band (Flat) 4″ 600340004 1.10 83.6*74.3mm T4 Divided V-Band (Flat) 4″ 600340002 1.10 87.1*81.4mm T4 Divided V-Band (Flat) 4″ 604340004 1.25 87.1*81.4mm T4 Divided V-Band (Flat) 4″ 600340005 1.25 96*88mm T4 Divided V-Band (Flat) 4″ 604340009 1.15 96*88mm T6 Divided V-Band (Marmon) 4″ | 5″ 600340003 1.32 96*88mm T6 Divided V-Band (Marmon) 4″ | 5″ 604340001 1.58 96*88mm T6 Divided V-Band (Marmon) 4″ | 5″