If I open the front window and back window in my car then drive at a specific speed I get a very weird woop-woop-woop and it feels like the air is pushing me back and forth in my seat. It pulses my head.
My car does this too. No previous car I've owned has had the same issue. Hopefully it isn't inherent to modern automobile aerodynamics because I'd like my next car to be one without it.
Wonder if it is something similar.