[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'S Catalytic converters are Compliant with EPA emission standards to reduce direct emissions of harmful gases such as CO, HC, NOx, etc. Reduces fuel consumption by stabilizing the accuracy of the engine’s oxygen system signal and controlling fuel injection. Fitment 2008-2011 Chevy HHR 2.2L/2.4L Automatic Transmission2009-2010 Chevy Cobalt Automatic Transmission2008 Chevy Cobalt 2.2L/2.4L Automatic Transmission2010 Pontiac G5 Automatic Transmission2009 Pontiac G5 Base / GT Automatic Transmission2008 Pontiac G5 2.2L Automatic Transmission 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 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. Eliminate P042 Code Error This catalytic converter can eliminate the “check engine light” caused by code P0420 (catalyst system efficiency below threshold). Before replacing a catalytic converter, please make sure your O2 sensors function properly. Faulty sensors can cause damage to spark plugs, and catalytic converters, and damage your fuel economy. 5. Attention If your vehicle is registered in California, New York, Colorado & Maine, DO NOT BUY This item.If your vehicle MEETS California REQUIREMENT, BUT NOT REGISTER In California, New York, Colorado & Maine. This will work on your vehicle.Due to the increased emissions standards. This item is not certified for sale in California, New York, Colorado & Maine. Package Included 1 X Catalytic Converter w/Installation Accessories [specification] Specification Brand YITAMOTOR Certifications OBD I / OBD-II / Federal EPA / Non-CARB Material Stainless steel Restricted States California, New York, Colorado & Maine Converter Type Universal Fit Inlet type Single (3-bolt welded flange) Outlet type Single (2-bolt welded flange) Overall Length 34.5 in. Oxygen sensor ports 2 Substrate Ceramic Other Part Number 53857,50459 Interchange Part Number 19421, 642061 Package included 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] - Internal Honeycomb Structure Design for Max Exhaust Flow- Improve the Efficiency, Clear the P0420/P0430 Code- Use Shockproof Packaging to Reduce Deformation or Damage- Not Legal for Sale in CA, NY, CO, and ME- 5-Year or 50,000-mile Limited Warranty[/des]