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You did not specify the year of your boxster.
The window squeal may be a regulator going out. They can make a racket when they're worn. You should remove the negative terminal from the battery, wait 15 minutes, then pull the door panel off and have a look at what might be going on.
There are susupension parts in the rear that go out on older boxsters. I think it's the tracking arms whose bushings wear out and need replacement. This could be it, or it could be something as simple as a loose bolt that holds your muffler in place.
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