[video]Refer to the YouTube video below, and you will have a better understanding of the working principles of the catalytic converter and tailpipe. Thanks to Automotive System [/video] Description YITAMOTOR direct-fit catalytic converter is designed to meet or even exceed OE quality and performance standards. Features heavy-duty stainless steel construction, internal ceramic substrates, and catalyst coating have been carefully engineered for maximum efficiency. Fitment 2001-2005 Honda Civic DX 1.7L2001-2005 Honda Civic GX 1.7L2001-2005 Honda Civic HX 1.7L2001-2005 Honda Civic LX 1.7L2004 2005 Honda Civic Value Package 1.7L Professional installation would be highly recommended Features 1. Maximum Efficiency for Exhaust Flow Internal honeycomb ceramic substrates have a porous structure to increase the reaction area and ensure sufficient catalysts (Pt, Rh, Pd) on the coating surface for a higher conversion rate. 2. Stainless steel shell, Durability Adopts a heavy-duty T409 stainless steel shell that highly resists heat, rust, and corrosion for longer service life, with no worry about bending or melting even in extreme conditions. 3. EPA Federal Standard Certificated All YITAMOTOR catalytic converters are stamped with an exclusive EPA number on the shell. YITAMOTOR offers a 5-year or 50,000 miles limited warranty, for any manufacturer defect. 4. Attention If your vehicle is registered in California or New York, DO NOT BUY This item.If your vehicle MEETS California REQUIREMENT, BUT NOT REGISTER In California or New York. This will work on your vehicle.Due to the increased emissions standards. This item is not certified for sale in California and New York. Package Included 1 Catalytic Converter w/Installation Accessories [specification] Brand YITAMOTOR Certifications OBD-II / Federal EPA / Non-CARB Material Stainless steel Restricted States California, New York, Colorado & Maine Fitment Type Direct Replacement Oxygen sensor ports 1 Substrate Ceramic Package included X 1 Catalytic Converter w/Installation Accessories Warranty 5 years or 50,000 miles limited [/specification] California Residents: Prop 65 Warning WARNING: Cancer and Reproductive Harm Visit:www.p65warnings.ca.gov [des] - Stainless Steel Shell, Long-lasting Durability- Use Shockproof Packaging to Reduce Transportation Damage- Metal Shaping Process, Fit Seamlessly to Prevent Leakage- Not Legal for Sale in CA, NY, CO, and ME- 5-Year or 50,000-mile Limited Warranty [/des]