Hi.
It might also be an idea to check your springs.
A while ago, I too had a "clunking" noise as I made slow turns.
I discovered that one of my rear springs had snapped about 2 inches from the bottom. The clunking noise was the sound of the spring moving around on top of the broken piece as the suspension travelled. My guy at MB said that this is fairly common, more so in extreme conditions/ weather.
I have since installed Eibachs.
This may not be the cause of your noise, but just a thought.
