The 2021 Audi S4, part of the B9 generation, is a performance-oriented luxury sports sedan that engages enthusiasts with versatility and advanced tech. All versions feature a 3.0-liter turbocharged V6 engine that produces 349-hp, paired with an 8-speed automatic transmission and quattro AWD system, providing assured cornering and grip. The S4 offers three trims: Premium, Premium Plus, and Prestige, each building in tech and luxury features. Premium safety features range from adaptive cruise control to Audi's pre-sense collision mitigation system. Inside, a 10.1-inch touchscreen display with the latest MMI touch interface supports Apple CarPlay, Android Auto and a 19-speaker, 755-watt Bang & Olufsen sound system. For 2021, Audi has made the previously optional S sport package standard, which includes red brake calipers and a sport rear differential.