Re: BA Turbo
The turbo itself is just fine; it's a fairly large unit rated to around 650HP, it is only having to cope with 6lb boost in stock form, so it's relatively unstressed, and should last many years without problems whatsoever.
As for the drivetrain, at standard power levels it should be just OK. If not, replace under warranty. The manual gearbox, with a max torque rating of 447NM, is at the torque limit of the motor.
I've no idea why you think most turbo cars are "forever in the worshop". I have 4 turbo cars, and strongly dispute that comment.
Modify the car, and it's another matter. If an auto, go to 260-280rwkw, and your best to upgrade/strengthen your auto; if manual, go tor 280rwkw and you'll need a new clutch, as it will slip, over 300rwkw and you'll possibly destroy your gearbox (how do I know: mine is stuffed).