I'm not trying to silence people, I'm simply correcting wrong statements. Lots of non technical people here are proposing solutions that simply make no sense from an engineering point of view, like fixing this noise by changing a gear. One reason for this is lack of technical knowledge, but the more important reason is that people actually come here and talk about different issues and call all of them a "motor noise". If someone comes here to complain about a motor whine, and it turns out that it was a bad bearing, or bad gear, or a failure in the rotor rubbing against stator, or countless other problems, then people will believe this will fix their harmonics noise problem, and if i say that has nothing to do with it, you'll complain that I'm trying to silence people? The fact that some people can't hear this high frequency is not proof that their car doesn't make the noise. Also i don't believe some cars start to make this noise later, as long as we're talking about the harmonics high frequency hiss, and not some other mechanical problem. I didn't hear that noise in the beginning either, not because the car wasn't making it but simply because i wasn't looking for the noise. Once i read about the noise and listened for it, i heard it. Even today i can't hear the noise unless I accelerate or regen with window open next to parked cars or large buildings. 99% of the time i don't accidentally hear this noise. So most likely the people that didn't hear it before a certain point didn't have the precise circumstances required to hear it.