[rootus]

Originally Posted by nearwater

I believe rootus was replying to OP.
The buffeting/pressure change is causing the headliner to 'flutter'.

Yep, that is correct, my point is that the headliner is responding to the air pressure flutter, not the cause of it.

For what it's worth, the technical term is Helmholtz resonance:
https://en.wikipedia.org/wiki/Helmholtz_resonance

I have noticed anecdotally that it has only been a problem for me on newer cars. I suspect that maybe improved aerodynamics makes the problem worse, and that is why it is more of a thing with newer cars and not older ones.

[wwiiavfan]

Maybe they should bring back the vent windows.

[Soleil]

Originally Posted by wwiiavfan

I tried searching for this without success so sorry if it has been covered before.
Does anyone have a fix for the headliner fluttering above 40 mph with one or both windows down?
It acts like a giant speaker and it is hard on your ears. Would like to cruise with the windows down but it kinda sucks right now.

A Windflector helps. But I think it is not available for a Camaro