Porsche upped the power while making it cleaner, cutting CO2 emissions and fuel consumption by around 18%.

The 911 Turbo has landed may look familiar, but it has evolved in true Porsche fashion. Visual giveaways are limited to chrome headlight surrounds and restyled foglights, but the real improvements are reserved for under the skin.

An all-new 3.8-litre direct-injection, twin-turbo flat-six, delivering 500bhp results in amazing performance – it's only the second road-going 911 to ever breach the 500bhp barrier after the current 530bhp GT2. That additional 20bhp gives the performance figures a healthy boost. At 3.7 seconds from 0-60mph it’s three tenths quicker than the current Turbo, and tops out 1mph higher, at 194mph.

The PDK twin-clutch gearbox can now be specified with standard wheel-mounted levers – pull the left to change down and the right to shift up, a big improvement on the outgoing model's. Most impressive of all though is that Porsche upped the power while making it cleaner, cutting CO2 emissions and fuel consumption by around 18%.

The cars are due to go on sale in the UK on November 21, priced at £101,823 for the hardtop and £109,048 for the convertible...