Bearcat and others - there are Stainless steel exhaust system suppliers in Europe as well. These systems are recommended by retailers like Van Dijk - principally because they are superior to the MB stock system, and they are cheaper to boot ...
Plus they go together with clamps rather than requiring welding (which is a tricky process, to get the system installed hanging just right) and, if you ever need to take (parts of) the exhaust system back off, for example to work on the rear end, the clamped system is much easier to take off.
I drove Michael Salemi's car (with Timevalve system) last month in Ohio (thanks again Michael) and the exhaust note was just fine.
My car needs a new system soon (same time as I will be installing the rebuilt engine) and I will go with the Van Dijk recommended stainless system.