For the 2013 Porsche Panamera, a new GTS model fills the gap between 4S and Turbo, while a Platinum version of the base V6 car also debuts.

The 2013 Porsche Panamera luxury sport sedan carries an ever-expanding portfolio of performance credentials. The Panamera lineup now includes rear-wheel-drive, all-wheel-drive, naturally aspirated and turbocharged models. There's even a gasoline-electric Panamera S Hybrid.

For 2013, Porsche fills the almost-imperceptible gap between the 4S and Turbo models with the new Panamera GTS that has attributes of its bookend brethren in one specially configured sedan. And this year also brings a fancier version of the entry-level V6 car, dubbed Platinum. These latest additions bring the impressive Panamera lineup to a total of 10 cars from which to choose. Among them, the list prices are separated by a cavernous $100,000, while engine output ranges from a respectable 300 horsepower to an awe-inspiring 550 hp.

Regardless of model, the interior of the Panamera is at once luxurious and purposeful. With uncharacteristically comfortable seating for four adults, the utility of this sport sedan is further aided by the unique hatchback configuration that allows for ample luggage space or, when needed, generous cargo capacity when its rear seats are folded forward.