Turbo!
Guy,
Even the T88H which is the new turbo from Greddy is only rated at 800 ps, which is not far away from 800 bhp..
I know this for sure as i have discussed this issue in length with Tim @ SVS a few weeks ago!!
I would comment though that there is various exh housings available fot the T78 a 24cm item and for the T88H a 22 cm item, which would obviously increase flow and higher bhp output!
I suppose the only way to be sure is to have the turbo flow tested on a GARRET flow bench, which i have done with mine when it was off the car a while ago, will dig out results!
Cheers
Stu