Downpipe designed for: Audi TT 180HP 1.8T quattroDownpipe by TurboWorks, made of stainless steel. Dimensions are shown in the photo. Diameters: Diameter DP 3 "(77mm) Inlet from turbo side 88mm Final reduction for serial 55mm exhaust Downpipe for serial exhaust. After cutting this element off and connecting it to the larger exhaust, we obtain a full diameter along the entire length.Downpipe designed for: Audi TT 180HP 1.8T quattroDownpipe by TurboWorks, is made of stainless steel. the exhaust includes a narrowing to match the downpipe to the series exhaust.