Hello. Haven't we met before?
Well, there was an Audi S1 before. It stalked the WRC stages in the early 1980s, a Group B car in the era when rally cars really were from planet crazy. This isn't. It's a four-wheel-drive hot hatch. It's an Audi A1, its bonnet stuffed with an uprated version of the Golf GTI's two-litre turbo engine, revised front steering and suspension, and new rear suspension to accommodate the 4WD system.
But what about the A1 Quattro?
My what an Audi obsessive you are. Yes, there was a limited-run A1 Quattro two years ago. They made just 333 of the wonderfully crazy cars in LHD-only. But there were differences from this S1. It used the slightly more powerful old EA113 engine, not the new, torquier, EA888. Since you're an obsessive you'll already know that the EA888 has chain-driven camshafts and variable valve lift.