Because I'm an engineer I'm pedantic.You do not have to have the electronic engine noise on. There are 4 engine noise modes: whisper, engage, unbridled, and off. I personally plan to spend much of the time in “off.”
There are 3 driving modes, whisper, engage, unbridled. Each has a fake engine noise associated with it as well as interior graphics/color changes and throttle/braking response changes.
The interior noise can be turned off in all three modes, but you can't take your car out of one of the three modes.