Audi Sport quattro

When Group B rewrote the rules of world rallying, Audi answered with the Sport quattro, a homologation special conceived to make its all-wheel-drive coupe faster and more nimble on a special stage. To qualify for the category, the company had to sell a run of road-going cars, and it did so at a price that reflected the exotic engineering underneath. The result was one of the rarest quattros ever offered to the public, with just 224 examples reaching customers, and today it ranks among the most coveted.

The most visible change was in the silhouette. Engineers cut roughly a foot from the wheelbase between the door and the rear pillar, giving the Sport quattro a stubby, upright stance meant to sharpen its reactions. A carbon-Kevlar body kept mass in check, and beneath the bonnet sat a turbocharged aluminium five-cylinder with four valves per cylinder. In road tune it produced 302 horsepower; in full competition specification the same architecture was rated far higher, and the works cars became some of the most fearsome machines of the Group B era.

Homologated between 1984 and 1986, the Sport quattro weighed roughly 1,200 kilograms and paired that relatively contained mass with its short, purposeful body and Audi's defining four-wheel-drive traction. Its competition sibling wrote one of the enduring chapters of the era: Michele Mouton drove a Sport quattro to a record-setting victory at the 1985 Pikes Peak International Hill Climb. With only 224 built, the car remains the definitive expression of Audi's Group B ambitions and a cornerstone of the quattro legend.