Loud Button: ECS Valved Cat-Back Exhaust for Your Audi B8 S4

Perhaps the most tempting part of owning a B8 S4 is the sound produced by the 3.0T FSI engine. The downsized engine from the previous V8 models still offers the grunt of a higher displacement engine, but it is now paired with the iconic supercharger whine and exceptional fuel economy for its power output. With [...]