Another day, another spate of hopped up Audi A1 photos. This time, shooters nabbed a five-door S1 Sportback prototype out for testing. Boasting the hallmark quad exhaust outlets of the Audi S models, this car is the best indication we've had so far that the automaker is considering an S1 in both three-door and five-door guises in the EU. Word has it the sporterized A1 would bow with a turbocharged 2.0-liter four-cylinder engine with between 220 and 240 horsepower. That's a tick under the wicked A1 Quattro with its 252 horsepower mill.
As you may recall, that machine was a limited production creation with a wild body kit and prominent rear spoiler. Something tells us the S1 Sportback prototype you see here is likely aimed at a wider audience. Photographers spotted it frolicking about in the snow with an S3. Check out the full gallery above for a closer look.