t34 0.48 will struggle to get to 400bhp - needs the 0.63 exh housing to make it - even then it will only last 12-18 months at the boost required for that power. You will spend 5-600 quid everytime on a rebuild, every 12-18 months
Not worth it imo, you will be better goin for a bigger turbo that can handle 400bhp easily.