New Audi S6 and S7 Sportback arrive with turbo V-6 power

Audi has finally added spicier S versions of its redesigned A6 and A7 Sportback that launched last year, and the wait has definitely been worth it. As expected, the cars have ditched the 4.0-liter twin-turbocharged V-8 of the previous generation in favor of a 2.9-liter twin-turbo V-6. Despite the drop in cylinder count, peak output remains...

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