The Porsche 911 offers sports car buyers a bewildering number of configurations, including turbocharged, all-wheel drive, coupe, and convertible editions. The base 911 starts out with 350 horsepower from a flat-six engine mounted behind the rear axle, while the fire-breathing Turbo S grinds out 560 horses and 553 lb-ft of torque. Buyers can also choose between either a seven-speed manual or a seven-speed dual-clutch automated manual gearbox when ordering the 911.