Dual Ball Bearing GT2871R turbo assembly with T25 style turbine inlet. Comes with internal wastegate pre-assembled when purchased with T25 style housing. Optional "T3/T4 drop-in" style turbine housing available for an easy retrofit into older T3 based applications where T3 turbine the inlet flang is required and either internal or external wastegate are used (internal wastegate assembly is not included when ordering T3/T4 drop-in configuration). This turbo is great for small displacement engines up to 2.2L and has the ultimate spool up time compared to other units. This turbo has a flow capacity of about 400HP. The external packaging of this turbo is identical to that of the GT28RS and can be a nice stealty upgrade to step up to 400HP of flow without much re-arrangement. Turbine -Wheel: 53.85mm w/ 76 trim -Housing: .86 or .64 ar -Maps Compressor -Wheel: 71mm w/ 56 trim -Housing: .60 ar This unit is usually in stock and ships within 1-2 days.