You guys are quick, thanks for the replies! The shocks were checked and all seemed ok.
My initial suggestion, just by the sound, was the exhaust hangers, but he said they seemed ok also. Maybe they need checking again.
Your pen story hits close to home, as I just had a pen removed from a vent a few weeks ago. When cornering, it would slide back and forth, but he located that one in seconds.
But the sound is much more dynamic and involving what appears to be several metallic parts.
I'll be in the garage banging car stuff.
01 S55 AMG Silver
01 CLK55 AMG Silver