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No idea what or where the sounds are coming from, but no matter whether its a calm day or windy (more prevalent with wind), but I get these sounds at highway speeds all the time, and can be quite annoying.

I have looked at the holes for the roof rack mounting points, taped them over, and nothing worked. Taped over that hole in the lower left edge of the Windshield (guessing that is from the one fender bender this car had early in its life before I owned it, No frame damage or setting off of airbags, car has clean 1 owner title, before me).

We were thinking at one point maybe the custom aftermarket aluminum billet grill, but I can see how that would be causing it.

Still at times it almost sounds like mechanical, like a bearing squeal, but it changes tone at different speeds, higher to lower, and what not, and sometimes if windy enough, I can get it much louder at the same speeds when its quieter with little to no wind, which makes me think its an airflow issue somewhere.

It doesn't affect the cars performance, (Check engine light is on, but thats for a Camshaft Sensor that needs replacing), its just a very annoying audible aesthetic issue if anything.