Audi S6, S6 Avant, S7 Sportback - 3.0L V6 TDI gets 48-volt system, electric compressor; 349 hp & 700 Nm!
Audi, after having introduced the electrified SQ5 TDI in February, has made the same powertrain available on the S6, S6 Avant and S7 Sportback. The three cars are making their debut for …