Yep I bring my SDL up to 90 all of the time!
I can run it all day at 90-100 with one hand on the wheel. I have had mine up to 110 and 120 may be possible. At 4,100rpm you only have 700 or so to go before the cut off. I think the 300D's top speed is 130ish. I know an SDL will not go faster then 120 stock.
MB's are built for speed, the W124 in highly modified 500E form can do 180 stock, and will probably run to the door of 200 with some mods.
My friend has ran his dad's S600 up to 110, he didn't even realize he was going that fast until he looked at the speedo. That big 12 just pulls and never stops.
