Exhaust hanger rubber weak from years of heat exposure. Mine got so bad that they broke the seal on the midpipe. Just figured it out the other day. They get too soft laterally and the muffler bangs around in the tunnel. Easy way to check, see if the heatshield in the muffler tunnel has gouges in it from the pinch weld. Could also be the top from over extension over negative curvatures.
S52|ZF|TRM Coilovers 670/895|Staggered 18" 5's