Rover's 1984-1987 MG Metro 6R4 is perhaps the hairiest representation of the kind of complex British engineering we can all get behind. This mid-engined can of hot sauce was already an angry riot in its day, but pair it with a current WRC driver's talent, and it will bring the kind of speed that triggered the Group B ban in 1986.
Built on a 95-inch wheelbase around a tubular frame designed by Williams, Rover's Group B entry used a naturally-aspirated V6 (unlike its turbo competition) based on the Cosworth DFV. Unfortunately, just like Ford's equally late RS200, it was late to the game. But with over 400 horsepower and a limited-slip diff, it also preferred not to advance in a straight line.
As you can see from this sales brochure with swiftly-adjusted output figures, once Austin Rover realized this homologation special's racing class was banned, you could get one of these babies for a bargain past mid-1986.
Some 30 years later, Citroën WRC driver Craig Breen got himself an equally good deal, driving a 6R4 up in Ireland. Luckily, he also put a camera on his helmet, so enjoy, and don't be alarmed.
Too bad about that followed. These old cars...