The N-line is Hyundai's high-performance designator, like Type R for Honda. It has way more power than you would ever need for normal driving, hopefully to be used on a track and not street racing. The normal Ionic 5 has no faked engine noise (beyond the low-volume external sounds required by law).

There's probably a federal or local law requiring some sound. Like the Waymos that incessantly beep beep beep when backing up at the recharging station at 1 mph. You're about five years away from hearing beep beep beep everywhere you go due to the proliferation of driverless vehicles.

To be clear, the exterior sounds hybrids and EVs make is different from the "engine" sounds the Ioniq 5 N pipes inside the car.

I mean, no one would buy the Ioniq 5 N specifically if they didn't want the zoomy car sounds! (OK maybe they just want the fastness! Fair enough)

But yes, they can be turned off.