Spied: Audi Also Working on Sportback Version of New S1 Quattro

Back in the summer, our spies snooped out a three-door Audi A1 prototype in Europe, which we believed to be the future S1 Quattro. As it turns out, the Ingolstadt carmaker is also testing a five-door version of its pocket rocket, the S1 Quattro Sportback.