My rear swaybar "E" bushings broke on the weekend... Specifically the passenger side one... check yours it may have broken as well. That's what caused my new noise in the rear. I wasn't even ruff on the car, just some nasty potholes and bad driveway lips. Oh and on Friday the 26th of March my windshield cracked due to stress - right from under the rubber - it's being replaced along with the sqeaky front bushings.... and their painting my rear rotors... I went nuts on the service guy, told him to do everything!
What a car.... loves to be serviced!