My mates T88-34D is for sale if you are keen. It has a compressor wheel from a T51R on it.
Or I can sell you my Brand new T51R KAI if the offer is a good one
A friend of mine just did the same turbo swap.
T88 22cm to T51R KAI
They are closely matched power wise (500awkw+) however the 51R is 200rpm laggier.
Im going twin scroll with my T51R KAI
If you do have a GTST that runs 10s on drag tyres there is no way you would want to put street tyres on it, even on public roads.
Semi slicks are a must.