• Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
  • Image Credit: CarPix
Where there's smoke, there's fire. Only in this case, the smoke is the upcoming new Audi A4, and the fire is the S4 spotted undergoing testing in this latest batch of spy shots.

Snapped in both sedan and Avant wagon forms while undergoing testing on and around the Nürburgring – where else? – the next-generation Audi S4 will of course be based on the new A4 that's anticipated to debut in Frankfurt this September. That means MLB Evo architecture and styling that takes a page out of the new TT's playbook. But in S4 trim, it'll be altogether more performance oriented.

Expect an even more powerful version of the outgoing model's 3.0-liter supercharged V6, pumping out a good 340-350 horsepower to all four of its driven wheels. That power will help it keep pace with the new Mercedes C450 AMG Sport.

It won't have to take on the new C63 AMG directly, though, as that'll be the job of the next RS4 that will slot above it. But since that model may never make it to US showrooms, this will stand as the flagship of the new A4 family as far as the American market is concerned.

Related Video:

2014 Audi RS7 | Autoblog Unplugged

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