Dealership don't wanna do a lot of work on your car for just two stabilizing bar bushes. As whole suspension will come down just to replace 1500rs bushes. In my case they were the culprit for similar sound.
They're the common culprit here. As fellow pakwheeler suggested, try applying silicone spray to stabilizing bar bushes. Just to give you an idea stabilizing bar have bushes in the center. It joins the lower end of one side Z link to another side.
Also check exhaust pipe, any movement in it can also leads towards hideous noises.