Yeah, the 500 goes real well; before I bought it I was torn between a 500E and a 500SEL; power won over comfort I guess (not that a 500E is slumming it!).
As to room, there's not an inch of underhood space extra I can tell you; but the way the car accelerates at 100+MPH makes it clear why they did it
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Best regards, Michael
'92 500E
'88 300TE