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Mine is definitely still present and noticeable at operating temperature. It seems very tied to the throttle, like if i slightly tap the throttle it buzzes accordingly.

OK, If it can go away on its own, then it's definitely not supposed to be there. Now the question remains, what is it?

Update: took it in to the dealer yesterday, they didn't find anything and marked it was likely a "whine due to the gearing offset characteristic of the transmission". Unfortunately couldn't replicate a "cold start" so might have to leave it there overnight or something next time.

It does seem to be coming from the engine bay for me too. But even warm, the DI injector even louder than the engine seems off to me?

So whenever I accelerate the second my foot touches the gas I get a buzz almost like audio static or an electrical crackle that's different and louder than the engine up to maybe 4000 rpm. At higher speeds its not noticeable, but its all I can hear up to maybe 20 mph. Quirk in the engine or...

Mine is still a gray outline.