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 : mag23554 Description : Conv DF BMW 86 91 Material : Stainless Series : Standard 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 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 Components : Band Clamp=1;Bolt=2;Gasket=4;Nut=2 2899 : No 634 : Ceramic 3145 : Specific 353 : Yes Catalytic Converter Overall Length : 73.5 California Air Board Approved : No CAT Converter Air Tube Adapter : Not Air Tube Kit Adaptable Converter Body Size : OEM Core Substrate Material : Ceramic Emission : Non-California (49-State) Heat Shield Attached : No Inlet Size (in.) : OE Main Piping Diameter (in.) : Stainless Steel Material : Stainless Steel Outlet Quantity : 1 Outlet Size (in.) : OE Overall Length (in.) : 73.5 Oxygen Sensor Location : Pre and Post Converter Universal Or Specific Fit : Specific Gasket Or Seal Included : Yes Inlet Inside Diameter (in.) : OE Outlet Outside Diameter (in.) : OE Title : DF Converter WARNING CA Proposition 65 : No California Proposition 65 : WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov Body Length : 12.000 in. Body Width (in.) : 6.375 Inlet Connection Type : Bolt-On Outlet Connection Type : Bolt-On/Clamp-On Outlet Outside Diameter : 2 Components : Band Clamp=1 California Air Resources Board Approved : No Substrate Material : Ceramic Inlet Inside Diameter : 2.500 in. 1987-1991 BMW 325i Base L6.2494cc Exhaust, Mufflers & Tips::Catalytic Converter Direct Fit 1987-1991 BMW 325is Base L6.2494cc Exhaust, Mufflers & Tips::Catalytic Converter Direct Fit