Mercedes-Benz has taken the super-saloon power war to the next level of insanity with the all-new E63 AMG offering up to 450kW ... the previous 5.5-litre twin-turbo V8 for the performance ...

It is a match on power for the outgoing 450kW/850Nm E63's twin-turbo V8 – but down on torque – with a nine-speed torque-converter automatic transmission and variable 4Matic+ all-wheel drive.

While mum on the exact technical enhancements made, Piecha claims to have extracted 450kW and 840Nm from AMG's 4-litre twin-turbo V8 - that's up 75kW on the GT S engine on which it's based and ...