Interesting Doctor visit

Mopar Tim said

And that s all automatic. the select cylinder mode.

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No governor on the Hellcat, it's aerodynamically limited to that speed. My '06 SRT is the same way with it being aerodynamically limited to 176 mph (limit is from HP vs. Drag). It's also why the Charger Hellcat has a faster top speed than the Challenger Hellcat (Charger has less drag).

Only the 5.7L engines have governors on them and that's because of the tire and suspension rating of those packages. The engine can push the car faster than it is capable of handling so they put the governor on to keep it within the handling specs.