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Catalytic Converter for 2000-2004 Audi A6 Quattro 4.2L MagnaFlow 51849 no-abs ) 59 Substrate Material CeramicOverview: Keep the check engine light off with MagnaFlow OEM Grade Federal EPA Compliant Direct Fit Catalytic Converter 51849. With features including free flowing mandrel bent tubing and highly corrosion resistant, stainless steel construction, easily install this spun body converter yourself using the proper tools, no cutting or welding required. MagnaFlow's state of the art metrology department uses the latest 3D scanning systems during research