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There are no 3.8 Turbo engines as far as I know. Only 3.8 engines I know about are rare RS models (without turbo, of course).
I believe 993TT pistons should be bolt-on to N/A 3.6 motor, but they are rare and still not stonger/lighter that custom made JE's, so It might be better upgrade path.
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Thank you for your time,
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