The 2010 Porsche Panamera debuts as a large, 4-passenger, 4-door hatchback. Rear-wheel-drive S and all-wheel-drive 4S and Turbo models are offered. All use a front-mounted 4.8-liter V8 engine and 7-speed dual-clutch automated-manual transmission that behaves much like an automatic. S and 4S have 400 horsepower, while the Turbo has 500 horsepower.