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so, recap - trying to prevent chassis twist. ie, lift one front corner of the car and watch the door gaps change as the front axle twists relative to the rear axle. sometimes called 'cowl rattle' on convertibles. best case - alignment changes under load. worst case - your Z-top disintegrates from the flexing. probable case - some rattles over speed bumps.
if just racing best solution is a full cage - this ties front and rear axles together.
otherwise get a cayman - the metal roof serves the same function.
then anything that can stiffen the middle of the car and/or tie front and rear together.
like springs, any stiffening is additive to current rigidity - ie will improve the situation. so presume fastening stiff things to the car can only improve the situation, whether it is gluing in cabon/kevlar, welding in door bars, or bolting in chassis stiffeners. where does it all sit on the scale of diminishing returns? dunno; the miata and jdm stuff doesn't provide any quantifiable data on outcomes. but hey, at least CF doesn't add a lot of weight,
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