Porsche has revealed an updated version of its legendary sports car, the 911, which now features hybrid power for the very first time. The four-wheel-drive Carrera GTS features a 3.6-litre boxer engine that churns out 541 hp and can do 0-100 km/h in 3.0 seconds and has a top speed of 310 km/h. The hybrid powertrain has two electric motors that are coupled to a high-voltage battery. It corresponds in size and weight to a conventional 12-volt starter battery, but can store 1.9kWh of energy and operates at a voltage of 400V. For the best weight saving, Porsche has fitted a lithium-ion battery for…