In the Mustang world it's called a strut tower brace. It keeps the towers in one place - they can't move in or out because the "borrow" strength from each other. I don't know if the Benz is prone to any movement there but many cars are and mine definitely enhanced my 'Stang's handling. But when I put in the 5.8L it wouldn't fit so I lost the improvement.
Dan
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