6 speed on a BMW 540? is that some special model? I don't know what your top end is but those benz and mercedes can do 155 or so topped out and all day long like a drive through a residential area. Even the little ones are pretty good. I have an 89 190 benz with a 2.6 inline 6 and I could get over 100 very easily and should top out at 130 from what I read.
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