Hanging on but seeing its dominance decline, the traditional 4-door sedan is in a turf war with the crossover utility vehicle. But if you still prefer a "car" with some size to it, that's rear-wheel drive, with a former Corvette engine oh, and a stick shift - the choice is down to one. This is the 2015 Chevy SS. Finding an honest to goodness large car in the blue-collar segment …