Genuine OEM Audi Exhaust Silencer, part number 4F0253609BG. This component is responsible for reducing the noise produced by the engine's exhaust gases. It is located in the rear section of the exhaust system. This silencer weighs 6.621 kg. Genuine OEM exhaust silencers are engineered with specific internal baffling and chamber designs to effectively dampen exhaust noise while maintaining proper gas flow.