The impeller inlet diameter is measured about 2.7in/68mm (inside), 4.0IN/101mm (edge to edge). The compressor outlet diameter is measured about 2.4in/62mm (inside), 3.25in/82.5mm (edge to edge). On the turbine side the diameter is measure about 3.3in/84mm (inside), 4.5in/115mm (edge to edge).
I have read that this turbo was made for an 11 liter Scania bus, 9.6 & 12L Volvo engines. It has a 92 mm Compressor wheel with a 62 mm inducer. The turbine wheel is 86 mm with a 77 mm exducer.