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Since the V6 has base compression pretty high, you would need to limit turbo boost to say, 6 or 7 PSI. To really attain the big boost, you actually need to reduce your base cylinder compression. The 3.8L engines were around 7-1/2 to 1 base compression for the turbo applications.
The poor man's trick was to double up on the head gaskets. But the right way would be to install dished pistons to lower the base compression.
It seems the ECU has enough lee-way to get you enough fuel to suit your tastes, with a basic tune. Direct injection reduces the detonation effect so that's a plus.
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