View all 2023 Audi ... A4/S4 sedan and A4 Allroad wagon. The Black Optic Plus Package, available on A4s fitted with the more powerful 261-hp, turbo four-cylinder, now includes black exhaust ...

Aside from the diesel engine, the S4 is the latest Audi to gain a 48V electrical system, mild-hybrid technology ... with an offbeat growl to the exhaust note. As with the larger S6 and S7 ...

Buckle up, gearheads, because we're diving deep into the heart of Audi's B9 generation A4/S4 ... That's why they recommend the catback exhaust system, a mod that fine-tunes your car's acoustic ...