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While I'm not sure of the limitations of the stock tip tranny, I know that Kokeln makes a mean 968 turbo conversion.
It's quite possible that nobody has blown up a 968 tiptronic with too much power. The 968 is a pretty rare car, and most of them came with a 6 speed, which is naturally a better choice for performance applications.
You could always try driving with your Tiptronic, if it doesn't blow up, then you're fine. If it does, you'll end up swapping in a 6 speed anyways. Try talking to some domestic transmission builders like B&M or JET, and ask them what you can do to strengthen an automatic transmission.
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