After 30 years, the Audi Ur-Quattro still sends a shiver down the spine. So even though this is just a show car made for the 2010 Paris bash, it’s still easy to get a little giggly about it. The Quattro concept is based on the gloriously stonking RS 5, but with a shorter wheelbase and a lower roofline. The body is fashioned mainly from aluminum with a smattering of carbon fiber. And like the car to which it pays homage, there’s a turbocharged five-cylinder engine up front making 408 hp. A six-speed manual transmission sends that power to all four wheels. Audi says the car represents the systematic further development of a production coupe using high-performance technology. If this thing ever gets made, everyone else can go home.