MARK PHELAN: 5 models whose time has gone

Not all performance cars perform — on the street or the dealership sales floor. That's the reason enthusiasts shouldn't be concerned by GM's decision to drop a handful of performance models: the Cadillac STS-V, Chevrolet Impala SS, Cobalt SS, HHR SS and Pontiac G6 GXP.

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MARK PHELAN: 5 models whose time has gone