One of the longest running sports cars in existence, the latest Porsche 911- code-named the 991, will go on sale in the UK from December 2011. Featuring a lower roof, more bulbous headlights and sharper tail-lights the front track is also wider, improving handling. The engines have received several tweaks too. The standard Carrera's 3.6-litre flat six cylinder engine is replaced by a smaller 3.4 that is more efficient but produces more power, at 345bhp. The 3.8-litre found in the Carrera S now produces 394bhp. Performance when fitted with the PDK twin-clutch gearbox and optional Sport Chrono Pack is very impressive. The standard Carrera sprints from 0-62mph in 4.4 seconds whilst the Carrera S can nail the benchmark in just 4.1 seconds. The interior has received a major makeover that is inspired by the Panamera, but with fewer switches. Most owners will opt for the PDK gearbox but Porsche also offer a seven-speed manual option - the first of it's kind in a production car.