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It sure did on my 4.6
Couple of things the chip does;
Improves the shift schedule of the tranny, so that it doesn't shift as early as it does stock.
Advances the timing, and leans out the mixture (stock is too rich)
I believe the hp increase is around 15 or so, but don't quote me.
Haven't read up on the spec's for a 3.8 chip
And, stick with the SCT guys. They are the ones who taught everybody else how to do the tuning.
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