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Porsche's sleekly styled flagship 911 recently added new Carrera 4 and Carrera 4S all-wheel-drive coupes. The AWD system has a multi-disk viscous coupling and transfers between five and 40 percent of the engine's power permanently to the front wheels, affording both cornering abilities that just about violate the laws of physics, and improved traction on slippery roads. Slightly wider at the rear than rear-drive 911s, the AWD versions are able to accommodate wider tires at the back for even more grip. Elsewhere in the line, the base 911 Carrera comes with a rear-mounted, 3.6-liter six-cylinder engine that generates 325 horsepower and 274 lb-ft of torque. Top speed is a sensory-overloading 177 mph, with 0-62 mph times clocked in at a mere 5.2 seconds. The Carrera S versions, meanwhile, take this performance up a notch with a 355-horsepower 3.8-liter flat six that cuts the car's 0-62 mph run to 4.6 ticks of the stopwatch. Porsche's Stability Management System is standard on the S and available on the base Carrera 4 models; new functions this year improve the four-wheel disc anti-lock braking system's stopping abilities. Also available is an Active Suspension Management system that allows you to switch from what is already a sporty ride to ultra-grippy suspension settings with the flip of a switch. As if that's not enough, the 911 Turbo S comes with a turbocharged version of the 3.6-liter powerplant that provides an explosive 444 horsepower and 457 lb-ft of torque. Ceramic, composite brakes, 18-inch alloy wheels, and high-performance tires are added to the Turbo S as well. An amazingly long list of standard features includes four-wheel disc anti-lock brakes with Active Brake Differential, traction control, and front-side and side-curtain airbags. The options list is the longest in the industry, and affords almost total customization, albeit at a stiff price.