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Catalytic Converter for 2007-2008 Audi Q7 3.6L MagnaFlow 51947 quick-fix-fuel-lines Thread Size with 1/2" NPTOverview: Keep the check engine light off with MagnaFlow OEM Grade Federal EPA Compliant Direct Fit Catalytic Converter 51947. 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