This is a picture of the stock T3 turbo compared to a T3/T4 turbo. I sold this one but bought another one.

Specs for the new T3/T4 are:

t04e 50 trim,with a stage 3 exhaust wheel.

Turbine: Minor diameter 2.205-2.210 Major diameter 2.545-2.550

Compressor: Minor diameter 2.118 Major diameter 3.00