Porsche has added a high-performance GT4 model to its Cayman range. The first GT model to be based on the two-seater is powered by a 385 bhp 3.8-litre, flat-six engine derived from the 911 Carrera S - delivering a 0 to 62 time of 4.4 seconds and a top speed of 183 mph. It has been lowered by 30 mm and features an uprated braking system and a chassis enhanced with components borrowed from the 911 GT3. The new Cayman GT4 is on sale in the UK now, priced from £64,451 on the road.