Ah I see now, well any time you balance a turbo you generally see an increase in spool time since there is less drag on the bearings. Matching that with a lightweight billet wheel makes for a pretty snappy turbo. I have a customer with only a rebuild and a T04S/60-1 billet wheel and he can make 9 psi at 2000 rpms. The t350 wheel really opens up the engine but does bring the boost curve higher into the rpm range, so keeping the stock turbine wheel would be better for your usage.