The Audi Quattro was by no means the first four-wheel-drive road car, but prior to this they were exotic curiosities or (slightly) sanitised off-roaders. The UR-quattro was something different. Previously, the performance car was largely defined by an even number of cylinders, usually naturally aspirated and rear-driven. The Audi Quattro stripped all that away with a warbling five-pot and a turbocharged surge that brought white-knuckle wastegate-whistle adrenalin to a relatively mass-market executive coupé – one that looks like it’s been pounding the weights in the gym. The sheer brutality of designer Martin Smith’s vision is still staggering. Remember – the Quattro was launched when the condom-beaked MGB was still on sale.