Yeah , modern turbos are a bit costly, I had a GT2871r 56trim on mine (Standard engine) and it made 365bhp @21psi the exducer on compressor wheel is only 2mm bigger than the T34, which I believe is 69mm.
I now have a GT2860RS on it, don't know how much power it makes @ 21psi but imagine around 330bhp.

Cheers.

Tim