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Mercedes AMG GT gets new 503 bhp Twin-Turbo 4.0 litre V8 (video)

The new Mercedes AMG GT (pictured) gets the new 503 bhp Twin-Turbo 4.0 litre V8 We’ve speculated that the new Mercedes AMG GT – and, for that matter, futures ’63′ AMGs – will get a new twin-turbo V8 to provide the power as Mercedes look to move away from the naturally aspirated 6.2 litre V8 in cars like the SLS. And this is it. A new 4.0 litre twin-turbo V8 – the M178 engine – has been developed to replace the 6.2 litre V8 and, in initial tune, develops 503 bhp at 6250 rpm and 479lb/ft of torque from just 1750 rpm.

918 a match for Ferrari and McLaren in corners, says Porsche

Had you forgotten about the third contender in the hybrid supercar wars, given the furious competition betwen Ferrari and McLaren? Porsche’s hybrid 918 Spyder is that third competitor, which mates a 4.6-litre normally aspirated V8 to an 84bhp front-drive electric motor and a 127bhp EV motor helping drive the rear tyres. It costs £768,026, and though Porsche won’t quite admit as much, you can still buy one of the 918 being produced - unlike the sold-out LaFerrari.

Tesla Model S performance version to rival BMW M5

Tesla Model S with M5 Performance Our inherent scepticism about Elon Musk’s claims for the Tesla Model S refuses to go away, but Tesla are convinced they can deliver the Model S with a 300-mile range, great looks, great performance and top-end tecchy goodness at a sub-$70k price tag. And now, it seems, there is going to be a Tesla Model S with performance to rival the BMW M5. At an event yesterday in California, Elon Musk revealed that at launch – the Model S is expected to be hit the road in 2012 with UK cars arriving in 2013 – the Model S will in fact have four variants on offer.