I've had a 1996 Mazda 323 for a few months now, but it has suddenly started to keep absolutely ear-splitting noise while driving at any speed. It's a very odd, constant whooshing, like lots of air blowing through a pipe, or a distant jet-engine, and a frequency that some of my friends can't even hear.
Some say it's just tire noise, but this is far, FAR worse than that. It seriously hurts your ears to the point of tinnitus, and that's unacceptable for any car. What can be causing this, and how can I fix it?
Window seals
Window seals was my first guess, maybe check your door seals too. Does it make the noise while idle or <10 mph? Or only after a certain speed?
Try rolling your windows down.