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Exactly, Perfectlap. And SWilson, I am not saying that torsional rigidty makes a car faster in and of itself (although unless it adds weight, I don't see it ever hurting). Unless a car is very 'bendy', the impact on braking/handling will be marginal on flat, smooth roads. Where increased torsional rigidity is particularly helpful is on on irregular/bumpy surfaces - it allows the suspension alignment (and as a result, tire contact) to remain more precise than in a car where the structure to which the suspension is attached, flexes. This improves steering accuracy, turn in and, in some cases, even the size of the contact patch.
Lets face it, proper suspension alignment is very important in maximizing your car's handling capability. In this connection, small variances at the mounting point for struts and control arms etc., can be amplified over the length of the strut or control arm, resulting in significant misalignment in extremis from factory specs.
Brad
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