You can think of the seemingly nondescript SS as a stealth weapon: A serious performance car cloaked in an innocuous exterior with a spacious, comfortable cabin. Its ferocious speed, sporty handling, and fantastic brakes keep pace with many high-end sports sedans. The rear-drive SS comes fully loaded and is powered by a burbling 415-hp, 6.2-liter V8 from the last-generation Corvette. Fuel economy isn't its forte: We got a paltry 17 mpg overall with the automatic. Controls are simple, and standard safety gear includes forward-collision alert, lane-departure warning, blind-spot monitors, and rear cross-traffic alert. The firm but tolerable ride is a modest drawback for this kind of performance. A six-speed manual is available.