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Originally Posted by hlmiii
I've never heard a definitive answer. Again - it's probably the slightly different chassis/wheelbase and less rear overhang. In high-stress situations everything matters.
There is a longer distance between A pillar and B pillar support in the coupe. The vertical support is more evenly positioned and anchored in the sedan. That should also have some effect.
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If your talking about whether the coupe or sedan is more rigid in regular trim...It is the sedan. I visited BMWNA and talked to some very knowledgeable people and although the difference is slight, there is a difference.