Is more noise REALLY necessary??
The first thing I usually hear on any (stock exhaust) vehicle is the TIRE noise made from rolling over the pavement. Many a car have approached and I THOUGHT that they were a hybrid or an EV, but until close I could not hear an engine nor an exhaust tone. This may be mostly due to the car decelerating for the stop at an intersection but my point is that adding noise to an EV is not really a good solution. The vehicle DRIVER is supposed to (required to) be aware of their surroundings and unfortunately we no longer hold drivers accountable for their part in an accident - it seems to always be blamed on the other guy.
Cars already make noise, be it by the wind passing over them or the most noticeable the contact between tires and road. Additional noise is just that... NOISE.