The settings are in the center screen/radio vehicle settings (gear icon), not the cluster screen.
See page 5-42 in the manual.
On the center screen: Settings - Driving Mode - Engine Sound Management - Auto or Off
Auto follows the driver mode dial setting.
Off will leave the flaps open all the time...mostly. There are still the flaps forward of the mufflers that do stuff mostly in 4-cyl mode. I leave mine in the off (open) all the time. I also notice that on some up shifts, I can hear something is closed until about 1700RPM the valves open. The driver mode does not affect this behavior, all modes behave the same in the 'off' position.
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