Have a look on vwvortex.com. These things usued to be more popular over in the states before the later GT garrett turbos appeared. Also search Vauxhall and BMW forums. Seen a few setups over there.
As far as I remember, they are good for about 400bhp, maybe a bit more. Can't rememeber spool characteristics, tho the T3 turbine obviously improves that. You choose whatever fuel pressure and injectors you want depending on the ECU software. Gonna be at least 550cc injectors for that power.
Do you have the turbo? Id not, there are better supported setups nowadays, like IHI, Misubishi TD series, Garrett ball bearing etc.