With a gorgeous cabin, understated looks, and a potent powertrain, what's keeping the S4 from being the class leader?

The distinction between the Audi S4 sedan and the coupe-sedan S5 Sportback has always been subtle, both cars offering four doors and turbo V6 power. Now Audi is simplifying matters further by ...

The Audi S4 Avant is a remarkably effective and seriously quick estate car. Its Jekyll and Hyde personality is addictive, transforming from competent cruiser to ballistic bahn-stormer at the flick ...