The RS4 packs more than enough punch for the German Autobahn. With 444bhp, it can get from 0-62mph in just 4.1sec and onto an electronically limited top speed of 155mph (this can be increased to 174mph as an option). That performance comes courtesy of a turbocharged V6; an engine shared with the Porsche Panamera 4S. In normal use, it’s a smooth and refined unit that fades into the background, while in Dynamic mode, it howls and parps. However, a turbocharged V6 will never be able to compete with the monstrous V8 in the C63 – an engine that sounds truly wonderfully and more engaging at almost any speed.