Porsche has announced the latest additions to join the 911 model family, the Carrera 4 and the Carrera 4S all-wheel drive coupe.

The new 911 models are 44 mm wider over the rear arches. The rear wheels of the Carrera 4 can therefore be fitted with 295/35 ZR 18 tyres, and the Carrera 4S with 305/30 ZR 19 tyres.

Powered by a 3.6-litre six-cylinder engine, which has an output of 325bhp, the Carrera 4 accelerates from 0-62 mph in 5.1 seconds and has a top speed of 175 mph. The 4S model, with a 3.8-litre engine develops 355bhp and can reach 62mph in 4.8 seconds and has a top speed of 180mph.

Porsche Stability Management (PSM) now has two new functions: the brake system is pre-filled ready for a full brake application, eliminating the air gap between the pads and the disc.

The second new PSM function is activated if the driver depresses the brake pedal quickly but not forcefully. In this situation, the hydraulic pump builds up extra pressure to bring all the wheels into the ABS range and ensure optimal braking.

The 911 Carrera 4 will be priced at £62,930 and the 911 Carrera 4S at £69,900 and will be available in the UK from October 22.