Sharper design, greater performance – the 2018 Porsche 718 GTS Models More power, exclusive equipment ATLANTA, Oct. 17, 2017 /PRNewswire/ -- Porsche is expanding the mid-engine 718 Boxster and 718 Cayman model lines with new GTS models. A newly developed intake plenum and an optimized turbocharger increases the output of the 2.5 liter flat-four cylinder engine to 365 horsepower. This is 15 horsepower more than on the 718 S models and up to 35 horsepower more compared to the previous generation of naturally aspirated Boxster and Cayman GTS variants. Like all 718 model variants, the new GTS derivatives come standard with a six-speed manual transmission. The seven-speed Porsche Doppelkupplung (PDK) dual-clutch transmission is available to order as an option. A number of performance-enhancing options such as Porsche Torque Vectoring (PTV) including a mechanical rear-differential lock or the Sport Chrono Package are standard on the GTS models, as well as Porsche Active Sus