The Porsche Cayman as first introduced in 2006 with the GT4 model being announced in and produced in 2015. The car is a available as a 2-door coupe. Check Out This Amazing Porsche Cayman GT4 Video The Porsche Cayman GT4 Engine The Porsche Cayman GT4 is powered by a 3.8 Litre naturally aspirated rear mid mounted 6-cylinder engine. The engine delivers 287 Kw (385 bhp) via a six speed manual gear box to rear wheels of the car. The Porsche Cayman GT4 Top Speed The six cylinder engine o..