Have you seen
Ray Hall Turbocharging - Java turbocharger flow map calculator
They have a nice calculator on there website
I tossed some comparable numbers at the T3 45 trim (I think this is in the .42/.48 T3's) map. If you choose a more moderate (I don;t know if 80% is even realistic) VE value it starts to look really nice.
Happy web boosting
-Noah