Why does the TT A8L barely make more HP than the Mustang GT?

For reference, the A8L comes with a twin turbo 4.0L V8, making 450HP. The Mustang GT is naturally aspirated 5.0L V8, making 435HP. Why the minimal HP difference? Is it just the displacement difference or is there more to it? Because a twin turbo 5.0L supposedly makes 700+ HP.


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