Muffler/exhaust hangers? I know mine are shot and I've been in the process of replacing them for 4 months now (read the lazy procrastinator hasn't started yet). It makes some noise, especially upon decelleration. I suspect as the exhuast system heats up the rubber rings may get enough stretch to cause the rattle and banging?

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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)