Well im sure if you had took the time to read the above, you would realise the part number relates to the GT2860RS which is the disco potato, but people also refer to it as the GT28RS.

Garrett Number: GT2860RS Part Number: 739548-5001
Comp Housing: .60 AR Turbine Housing: .86
Internally Wastegated, 320HP. T25 Flange, commony known as teh "Disco Potato" or GT28RS, great upgrade turbo for the SR20 engine, although some minor modifications are required to air intatke and boost outlet piping.