I have my car in the air tooooooo many times to find this noise, replaced links, sway bar bushings are next, have tighten everything, checked all suspension, always blamed it on the air ride system but maybe I am wrong,
one thing I did notice was the inner plastic(abs) fenderwell rubs on the inner lip of the fender I have killed all 4 (ran tooooooo low)

and are going to be replaced after the bushings.......
Yep the noise is at your feet.
I hope one us figures this out I have to run stereo pretty loud not to hear the rattles.