Was gonna say, Tommys one is pussy compared to that, its a GT42 varient, there on loads of cars, my mate has one on his normal Skyline road car.
Tommys GT42 isnt a standard one, but there are tons, thousands upon thousands, of GT42R powered cars in the world, they just a decent 850-1000bhp turbo.

This turbo is just huge for a garrett GT-R (ie performance/tuning one) there are way bigger garretts around, and way bigger performance/tuning) ones made by other companies (Precision, Turbonetics, and so on).

Aduz- Thats a Turbonetics Thumper, T6 frame same as the turbo on this thread, thatd be a T101, T106, who knows, impossible to tell as they all look about the same on the outside.
Could be upto 2500bhp's worth of turbo depending which one it is.