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Milltek Sport - Cat Back Exhaust (Multiple Options) Audi S4 B6 (4.2 V8) OPTION:NONE RESONATED (LOUDER) Refresh the front end ofFITS: Audi S4 4. 2 V8 quattro B6 Saloon Sedan, Avant, & Cabriolet 2003 to 2005 Why Buy a Milltek Sport Exhaust? Milltek Sport stainless steel exhausts have a genuine performance edge noticable power gains, sounds that are truly awesome, styled looks that are aggressive but discrete and a feeling of true exhilaration. Transforms performance and driveability Sharper throttle response Substantial weight saving over original equipment exhaust systems