Porsche is adding even more sportiness to their line-up.They’re introducing the new Porsche Panamera GTS and Panamera GTS Sport Turismo. Power comes from a four-liter twin-turbo V8 engine generating 453-horsepower and 457 lb.-ft. of torque, peaking from 1,800 to 4,500 RPM. That’s 13 more horsepower and an additional 73 lb.-ft. of torque over the naturally aspirated 4.8-liter V8 in the previous Panamera GTS.An eight-speed PDK dual-clutch transmission sends power to all four wheels. The sportiness is more than under the hood. These new GTS models sit 0.39 inches lower than other Panamera models with the standard air suspension recalibrated specifically for them.Both GTS models are positioned between the Panamera 4S and Panamera Turbo.The Panamera GTS starts at $128,300.The Panamera GTS Sport Turismo begins at $134,500. On sale now, we'll be getting our first drive in both models at the end of the month.