Geneva launch: Fastest ever Audi A3

Audi have just shown their fastest ever 'A3 Concept' at Geneva – a compact four-door saloon, offering a thunderous 408PS and 500Nm (from as low as 1,600rpm, to 5,000rpm) and with a wicked 0-60mph in 4.1s and 155mph (limited) potential: A pocket RS4 or RS6 if you will. It will be powered by a big turbo 2.5-litre five cylinder TFSi engine, linked to a slick seven-speed S Tronic twin clutch transmission. Yet, in line with modern manufacturer goals, it will still achieve 31mpg and emit 212g/km of CO2. The very definition of fast, frugal and frightening speed stealth motoring eh?