[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 high-flow catalytic converters increased exhaust flow allowing your engine to make more power and improving vehicle performance. Fitment 2004-2005 Buick Rainier 4.2L2002-2005 Chevrolet Trailblazer 4.2L2002-2005 GMC Envoy 4.2L2003-2004 Isuzu Ascender 4.2L2002-2004 Oldsmobile Bravada 4.2L2005 Saab 9-7x 4.2L Features 1. Designed for excellent exhaust flow and clean emissions.2. Direct replacement for your factory converter.3. Bolts right into place - no welding, bending, or cutting!4. Internal catalyst has a honeycomb pattern for maximized surface area and minimized restrictions.5. Body and pipe heat shields are made of high-quality materials for durability.6. T409 steel construction and welded seams for long life and durability.7. Complies with EPA standards, non-CARB.8. 5-year / 50,000-mile warranty. 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 Warranty Warranty Period: 5-year / 50,000-mile warranty.Return: Goods can be returned within 30 days for Unopened or Unused Items.24-Hour Support: Customer service throughout the day. [specification] Specifications Brand YITAMOTOR Certifications OBD-II / Federal EPA / Non-CARB Material Stainless steel Restricted States California, New York, Colorado, Maine Fitment Type Direct Replacement Inlet Type Loose Flanges Outlet Type 2 Bolt Welded Flange Engine 4.2L Oxygen sensor ports 1 Substrate Ceramic Interchange Part Number 55476, 645878, 50365, 19100 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]