Yes, it really matters. The weight of a car and the cornering forces involved determine how much flex is exerted on the chassis. You would notice if you are familiar with torsional rigidity at all(which you clearly are not), that heavier cars like the Veyron tend to have high figures, while featherweights like the Exige or Elise tend not to need it as much. The more weight there is, the stronger the forces. Convertibles find themselves in the worst of both worlds as they add significant weight yet cut the rigidity in half.
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2005 E46 M3 Interlagos/Cinnamon with Sunroof Delete
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