The 2018 Audi S4 is the performance variant of the ... The start/stop system is unrefined because it turns the engine off right before the car has come to a complete halt. As with most Audis ...

The 2018 Audi S7 is one of two performance-minded variants ... In a 2016 First Drive, we said that the S7 offers effortless acceleration and the engine stays quiet even at high speeds.