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i'll disagree there. imagine a hard corner. inside wheel lifts and all weight on outside wheel. outside wheel trying to turn while entire mass of car trying to continue in a straight line. wheel will try to move inboard until all play in suspension taken up, at which point it will try to push top of strut outboard with a force equivalent to the cornering g (say 1 g or more). if top of strut moves then you lose the benefit of your camber and reduce the amount of tire in contact with the ground - not a good thing when cornering at 1 g.
folks will argue that the boxster already has a front brace in that it has two diagonal braces coming forward from the firewall to the strut tops. these braces wo't do much to stop the tops of the struts from spreading apart, however, which is where the third brace comes into play - to stoo the tops of the struts from spreading apart. that's why they're aluminum or carbon fiber - they only need tensile strength not compressive.
required for the street, probably not. on the track wih r-comps, probably why not.
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