Ever since Mercedes proved you could get 360 PS from a 2-liter turbo engine, everybody has been looking at Audi for an answer to the A 45 and CLA 45.
It seems that answer is finally coming, as this S3 sedan has re-started its testing at the Nurburgring.
According to our friends at TouriClips, Audi was testing this S3 sedan at the Nurburgring late last month. The silver sedan prototype is equipped with GPS telemetry and other testing equipment, so engineers are taking these hot laps very seriously. The engine still sounds like a 2.0 TFSI, not a five-cylinder, so this isn't the RS3 sedan in disguise. So what is it then?