Don't know the exact term for it, but it's caused because you have 50+MPH air going into a closed box. The air has to escape somehow, so it goes out the back windows again. This is where the turbulence, noise and pressure comes from.... I had it too, so I just cracked the front windows open a bit, and problem solved! It's not a PT thing, it's any 4-door car with the back windows open, but not the front...spdracr said:Pops, yes I think we've all had that one. It's even mentioned in the owners manual of my GT. I don't have it in front of me to quote what they call it. But, it's something Chrysler recognizes.