No idea. You'd need to talk to Claire at Crap Engineering about stuff like that.
@JimmyP was/is in the process of twin turboing one, he was aiming for 350ish hp iirc.
I do however remember Claire chuckling at 350 saying "more like 500!!!!"
I've had a quick Google and the answers are all out there it seems - I just can't seem to read any of them at present as for some reason my phone is wanting me to view everything in Taptalk!!!!