I've owned one and been In a few others several years ago on t34.48, great upto 130 mph but in a street race against a cossie on a t34.63 the bigger turbo would walk away past 130 mph every time
that was my experience of them years and years ago

Great mid range punchy power though I can only assume the 0.48 is to much of a restriction at high rpms high load for a yb

 

I have just got a turbo technics t34 on a 0.55 housing, running 650cc injectors and bosch 044 fuel pump, standard engine internals and omex management, do we think 350bhp should be easily achievable? 4x4 intercooler