I Have A 1999 W220 S320. Lately There Is A Thud Noise - The Same Kind Of Noise That You Get If A Heavy Stone Hits The Underside Of The Body - When I Am Driving And Turn The Wheel To The Left. The Noise Sounds As Though It Is Coming From The Underside Of The Car Just Underneath The Rear Of The Driver's Seat. I Had Some Work Done Recently On The Self Levelling Suspension And Wondered If It Was Connected With That. Anyone Any Ideas On What It Is? Thanks.