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i guess the strut tower brace spreading issue is supported by the tension vs compression idea - thin aftermarket braces would combat towers spreading much better than they could withstand towers trying to come together. also supported by what i've seen on my car - on jack stands the strut towers appear to be spreading - shoulders drooping - as the front fenders are sitting lower than the trunk; this goes away when on the ground. variation between cars may be due to age = metal fatigue, driving surface, suspension stiffness (ie., how much force transferred to the chassis) and the witches brew that results when you combine all these factors.
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