The world debut of the new Porsche 911 Turbo model 991 was organized in Moscow, in the Gorki park. The car was declined, already at its launch in September 2013, in two versions, the Turbo and the Turbo S. Both had a 3.8-liter engine, but the "S" had sixty more horsepower than the normal Turbo (580 versus 520). Equipped with 20-inch wheels, the Turbo S - as well as the Turbo - had widened wheel arches compared to the Carrera 4. Porsche developed a sophisticated rear spoiler system that operated in three positions and worked in concert with the variable front spoiler, thanks to a pneumatic control.