From what I understand, in a hard turn the force causes the strut towers to move away from each other, leading to loss of negative camber. This is particularly strong on the outside tire, which needs all the negative camber it can get to prevent rolling onto the side wall. The brace keeps the towers from spreading, preserving the negative camber.
On my car, before I had the brace, I noticed that the "caulking" around the strut towers was beginning to crack. Since I've had the brace, the cracking has not worsened.
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