The GT28RS will perform very well. The NS-111 turbine wheel can flow alot, but it will be hard pressed to get you to 350 whp. It will more likely max out around 300-325 whp. It will spool just as fast as a small T28 though, if not faster. Just go with the T3/TO4E .63 a/r in a 50 trim compressor, trust me. It is a very common setup for a reason.

-Mike