Porsche's family of 911 models just keep growing.

The latest addition is the new GTS variant, which means the 911 family tree now includes 19 models. Announced Tuesday, the GTS gets subtle power and chassis upgrades and will come in four flavors: a rear-wheel-drive coupe and convertible and an all-wheel-drive coupe and convertible.

Like the GTS upgrades on other Porsche models in its lineup, this package on the 911 is more of a collection of popular options grouped together to save buyers a little money.

But don't expect these to be cheap; the GTS coupe and convertible start at $115,195 and $127,095 respectively. The all-wheel-drive Carrera 4 GTS coupe and convertible start at $121,895 and $133,795 respectively.

For that money, buyers get the same 3.8-liter six-cylinder engine as the Carrera S. But it's been modified with a series of engine and exhaust modifications called the Powerkit.

This upgrade adds 30 horsepower for a total of 430, while torque remains at 325 pound-feet. Porsche's wonderful Sport Exhaust system is standard, as is the SportChrono pack that drops the cars' zero-to-60 mph times.

A GTS coupe with Porsche's optional PDK dual-clutch transmission will do the 60-mph run in 3.8 seconds, the automaker said.

The active suspension on the GTS has been lowered slightly, the interior has been draped with Alcantara suede throughout, and the exterior has been upgraded with bits of black trim and black 20-inch wheels.

All four versions of the GTS will roll into dealerships by the end of 2014.

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