[steve h]

my granddaughters asked me to open the rear windows,but when i got upto 50mph a loud booming noise was heard i thought the rear window was going to shatter as the vibration was bad i shut the windows quickly.Everything is ok with the front windows open.

 

[JOHNWALES]

Surely this is only wind noise. I have yet to own a car that does not experience the same annoying feature. One way to reduce this problem is to lower all four windows two or three inches.
Similarly, I have experienced this problem on just about every sun roof that I have had; to such an extent I no longer look for or order a car with this feature.