One of the longest-running models of sports car in existence, the latest Porsche 911, codenamed the 991, features a lower roof, more bulbous headlights and sharper tail lights. The engines have received several tweaks, too, with the standard Carrera's 3.6-litre, six-cylinder engine is replaced by a smaller 3.4-litre that's more efficient but produces more power – 345bhp. The 3.8-litre found in the Carrera S now produces 394bhp, with both engines offering seriously impressive performance – particularly with the PDK twin-clutch automatic gearbox. There's a lightweight 911 GT3 version, and high-power Turbo version, but in all honesty the base model will be more than enough for most drivers. There will also be a Targa version in the future, which features an electric hard-top roof that slides away. The interior has received a major makeover, too, inspired by the Panamera but with fewer switches and a classier feel. Most owners will opt for the PDK gearbox but Porsche also offer a seven-speed manual option - the first of its kind in a production car.