i'd agree with you except that, from what i've read, a proper bracing design is actually a triangle; each strut tied back to the firewall on a diagonal such that they meet at a common point, and then a third member tying the two struts together. the boxster has the tiebacks to the firewall, but doesn't have the member tying them together and relies on the integrity of the frame. i agree than a thin bar isn't going to do much on compression, but will work on tension and perhaps provide some benefit. regarding the rear bar, uncertain if any benefit at all, as there appears to be a lot of structure there already.
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