The 2013 Chrysler 300 SRT8 wears no hood scoop, no rear wing, and nothing that separates it visually from the six-cylinder rental-lot version parked next to it. Then you step on the gas, and a 470-horsepower 6.4-liter Hemi puts a lot of imported performance machinery in the rearview mirror. Launch control, three suspension modes, and a 175 mph top end round out one of the best sleeper sedans Detroit ever built. Read on to find out what makes it work.