looking at a t3 turbo ,could any give me some input on the exhaust housing meaning the size of it ,im thinking 50 ar means the size of the exhaust housing not to sure heres some numbers he sent were im buying one

Inlet: 3.0''; Outlet: 2.0''.
Compressor: 50AR; Exducer: 53.87MM; Inducer: 76.58MM.
Turbine: 50AR; Exducer: 56.41MM; Inducer: 64.93MM.


any input would be great