MagnaFlow Direct-Fit Catalytic Converters are designed for easy bolt-on installation for the Professional Installer. Each is designed to exact the original equipment specifications. While the majority of the Direct-Fit Catalytic Converter products do not require welding; cutting or bending; limited applications may require additional welding for optimal installation. PartNumber : mag49918 Description : Conv DF 04-06 Audi S4 4.2L Main Piping Diameter : 2.5 Material : Stainless Series : OEM Grade Anticipated Ship Out Time : Approximately 1-2 Days CARB Compliant : N Catalytic Converter Air Tube Adapter : Not Air Tube Kit Adaptable Catalytic Converter Format : Pre-Catalytic Converter and Main Catalytic Converter Catalytic Converter Oxygen Sensor Location : Pre and Post Converter Catalytic Converter Body Material : Stainless Catalytic Converter Substrate Material : Ceramic Catalytic Converter Inlet Diameter : 2.5 Catalytic Converter Outlet Diameter : 2.5 Catalytic Converter Width : 4 Catalytic Converter Length : 9.5 Catalytic Converter Overall Length : 9.5 Catalytic Converter Configuration : Direct-Fit Exhaust Component Mount Type : Uses Factory Hangers Exhaust Pipe Material : Stainless Steel Recommended Use : Converter Warranty : 5 year/50,000 mile External, 2 years/25,000 miles Internal 2899 : No 634 : Ceramic 601 : 2.5 1172 : 2.5 616 : 4 615 : 9.5 3145 : Specific California Air Board Approved : No CAT Converter Air Tube Adapter : Not Air Tube Kit Adaptable Converter Body Size : OEM Core Substrate Material : OEM Emission : Non-California (49-State) Inlet Size (in.) : 2.5 Main Piping Diameter (in.) : Stainless Steel Material : Stainless Steel Outlet Quantity : 1 Outlet Size (in.) : 2.5 Overall Length (in.) : 48.3 Oxygen Sensor Location : Pre and Post Converter Universal Or Specific Fit : Specific Body Length (in.) : 9.5 Body Width (in.) : 4 Inlet Inside Diameter (in.) : 2.5 Outlet Outside Diameter (in.) : 2.5 Title : DF Converter WARNING CA Proposition 65 : No California Proposition 65 : WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov Body Length : 9.500 in. Outlet Outside Diameter : 2.5 Catalytic Converter Overall Length : 48.3 Body Width : 4 Inlet Inside Diameter : 2.5 Body Length : 9.5 California Air Resources Board Approved : No Substrate Material : Ceramic Inlet Inside Diameter : 2.500 in. 2004-2008 Audi S4 Avant V8.4163cc Exhaust, Mufflers & Tips::Catalytic Converter Direct Fit 2004-2008 Audi S4 Base V8.4163cc Exhaust, Mufflers & Tips::Catalytic Converter Direct Fit 2004-2009 Audi S4 Cabriolet V8.4163cc Exhaust, Mufflers & Tips::Catalytic Converter Direct Fit