To us, the 2014 Chevrolet SS seems like one of those off-the-books sleeper sedans built exclusively at the pleasure of and for use by a General Motors executive. In what other scenario could you imagine transplanting a Corvette's powerful engine into a family sedan, then fitting aggressive transmission gearing, racecar supplier Brembo brakes, a sport-tuned suspension and every single mechanical and electronic option available? Yeah, right, they'll never sell that Chevy here at any price. Or so w