Anyone else have this high-pitch vibration noise?

[efwd]

The spring thing could be something you might want to investigate. Those are right below you though and I don't think the camera mic would pick it up and your ears wouldn't. I just installed my 912is exhaust and the manual advises using a heat resistant silicone on the exhaust retention springs to dampen vibration so.. seems that springs can do strange things.
Eddie

[David47]

Jared, is you external camera close by the wing strut to wing interface ?.

[Rodney]

Suggest you eliminate the springs by putting a 3/8 thick maybe 1/2 inch strip of silicon seal on them like efwd talked about. This will dampen the springs and change their resonate freqeuncy. Fly and retest

Rodney