Three years ago, the rumor mill was churning indicating GM would use a stripped down version of the Cadillac Sigma (called either sigma-lite or sigma-mass) rear-wheel drive platform (CTS, STS) to underpin such cars as a large Buick sedan and a Camaro successor. Since GM does not have the resources for a completely new structure, this is the next best thing. Mustang has proven it works and GM is chomping at the bit to get a piece of those overflowing Mustang sales.
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