WHEN THE 2 FRONT WINDOWS ARE UP AND THE 2 REAR WINDOWS ARE DOWN FULLY/SLIGHTY, THERE IS A TERRIBLE AIR POCKET CREATED INSIDE THE VEHICLE CAUSING MY EARDRUMS TO POP AND NEARLY BURST. A REVERB OF RUSHING AIR MAKES IT EXTREMELY NOISY AND HURTS THE EARS UNTIL I LET THE FRONT WINDOWS DOWN PARTIALLY TO RELIEVE SOME OF THE INSIDE PRESSURE.THIS OCCURS DRIVING AROUND 40MPH AND GETS WORST AS SPEEDS INCREASE. IT IS EXTREMELY DANGEROUS TO THE EARS AT HIGHWAY SPEEDS WHEN ONLY THE BOTH REAR WINDOWS ARE PULLED DOWN. MY EARSDRUM FEELS LIKE ERUPTING AT THIS POINT, UNTIL I LET DOWN THE FRONT WINDOWS SOME.*AK