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Mercedes E63 AMG (2011) gets twin-turbo V8

Mercedes has updated the E63 AMG super saloon with a range of minor tweaks, and one major one. Say goodbye to the 6.2-litre naturally-aspirated V8 engine which heralded the '63' badging, and hello to another downsized, forced-induction response to tightening emissions and economy requirements. The 2011 E63 receives the twin-turbo 5.5-litre V8 engine first seen in the S63 AMG, and now powering the CL63 and CLS63 as well. So the Mercedes E63 AMG is actually an E55 AMG?

New Volvo Drive-E engine delivers 444bhp – from just 2.0 litres

The new Volvo Drive-E engine (pictured) delivers 444bhp When Volvo announced its new Drive-E engine range would consist of just a single petrol and diesel engine of 2.0 litre capacity, we did wonder if Volvo had given up on the idea of delivering properly powerful road cars. But it seems not. We already know that the T8 hybrid powertrain for the new XC90 will deliver 394bhp, but now Volvo has revealed a Drive-E concept engine that delivers an even more impressive 444bhp without the aid of electric motors and batteries.

More Power! Get the details on the potent Porsche 911 GT3 RS 4.0

Porsche has ramped up the already heady performance of the 911 GT3 RS through the adoption of a new, naturally aspirated 4.0-liter version of the company's sturdy, horizontally opposed flat six-cylinder engine. The unit kicks out 50 hp more than the 3.8-liter six-cylinder used in the existing 911 GT3 RS. This mill claims 500 hp at 8,250 rpm, a figure which makes the speedster the most powerful naturally aspirated road-going version of the 911 ever.