A mysterious Audi S3 Sedan prototype was spied undergoing testing around the Nürburgring in Germany.

A mysterious Audi S3 Sedan prototype was spied undergoing testing around the Nürburgring in Germany.

It was little over a year ago when Audi unveiled the S3 Sedan so it's too soon for a makeover. Although Audi has shown recently a strong interest in high-performance diesels, judging by the soundtrack provided by the prototype we are dealing with a gasoline engine-powered vehicle. It's not the forthcoming RS3 since it doesn't have any camouflage and it looks the same as the S3 Sedan.

Taking all these facts into consideration, Audi is probably testing the rumored S3 Plus set to bridge the gap between the S3 and the RS3. The former has 300 PS coming from a 4-cylinder 2.0 TFSI while the latter will have around 360 PS from a 5-cylinder 2.5 TFSI, with a 400+ PS version being considered. A report issued back in January referred to an S3 Plus with 375 PS due in 2015 but obviously that won't happen and if there will be such a model, expect output to stand at around 330 PS.

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