This is the Porsche Cayman GT4, and Mat’s on hand to run you through all the upgrades compared to the standard Cayman! For starters, it’s easy to spot the GT4 when it's compared to the regular car. From the huge rear wing and diffuser at the back through to the massive front splitter at the front, the GT4 clearly looks like it means business compared to its baby brother. And trust us, the difference doesn’t stop with the looks! The GT4 is powered by a 4-litre naturally-aspirated flat-six which c