Hmmm could be the subframes. That's my best bet. Directly connected to the body transmitting sound into the cabin instead of isolating it. I am not sure if you can apply more lubricant there as they not easy to install to my best understanding.
track cars with non OEM bushings and other goodies may handle like the dickens but the brakes will squeal & the suspension will creak eventually.
keep us posted.
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