From a production perspective, it's probably more cost-effective for GM to just install upgraded springs/shocks/sway bars rather than remove weight through deleted options. We are a niche in the scheme of things, and niches don't pay the bills, mass-production does. Sad but true. If GM were to offer a low-weight model it would probably come with a higher price tag.
However, it would be nice if the Z28 or SS came with (at least) better shocks and sway bars right off the showroom floor as part of the standard package. I'm not sure how much spring rate GM could get away with and still provide mass- or near mass-production ride quality.
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