In 2015, a high performance track oriented version of the Cayman, named the Cayman GT4 was introduced, using a revised and a slightly de-tuned version of the 3.8-litre flat-six engine from the 911 (991) Carrera S. The GT4 was available only with a 6 speed manual transmission and weighed 1,340 kg (2,954 lb). It has a vented front bumper to improve cooling for the additional radiator, with a lower lip spoiler as well as a fixed rear wing for providing downforce. Compared to the standard Cayman, it features a 30 mm lower ride height, upgraded brakes from the 991 GT3, a limited slip differential combined with Porsche Torque Vectoring, and Porsche Active Suspension Management with dampers derived from the 991 GT3. A number of reinforcements were also made throughout the chassis to keep it stiff and well balanced. A Club Sport Package is also available, featuring a rear half rollcage, preparation for a battery cut off switch, a fire extinguisher and a six-point racing harness for the driver, compatible with a neck saving HANS device. Sport Chrono Package with unique Track Precision app is also available specifically for the GT4, adding an additional ECU to the car to deliver telemetry data to the driver's smartphone. In the United Kingdom, the GT4 could be ordered before its introduction at the 2015 Geneva Motor Show in March, and the first cars would arrive in dealerships in March. The Cayman GT4 has a projected Nürburgring Nordschleife lap time of 7 minutes 40 seconds and has a top speed of 183 mph (295 km/h). The GT4 has gained rave reviews from magazines like Evo and the likes of Chris Harris.
