Cadillac will expand the bandwidth of its "v" sub-brand when it appends that letter to the STS this fall. While the CTS-v packs the Corvette's rip-snorting pushrod V-8 coupled to a six-speed manual transmission, in the BMW M3/Audi S4 vein, the 2006 Cadillac STS-v will take on the Jag XJR and Mercede
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