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The 3.6 LLT and LFX have 4 valves per cylinder. The 3.8 is a conventional 2 valves per cylinder. That is probably most of the difference. The rest will come from how the exhaust is piped through the manifolds, cats, resonators, and mufflers.
I've owned and driven the 4th Gen 3.8 and the 5th Gen 3.6. I think the 3.6 sounds fine and will take the extra HP/TQ that go with it every time.
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