If you want to make a sleeper, then you’re gonna need power, and if you want power, then one of the most common solutions is an unholy amount of boost, either from a supercharger or a turbocharger.

Ever since Chevrolet's vaunted Impala SS died in 1996, there has been much gnashing of teeth over the lack of "traditional" performance cars at GM. A big, comfortable sedan with some rocks that fits ...