[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 the Automotive System [/video] Description Internal ceramic honeycomb structure substrates contain ample metal catalysts and offer a larger surface area to fully react. Fitment 2002-2004 Nissan Altima Base Sedan 4-Door 2.5L 2006 Nissan Altima Base Sedan 4-Door 2.5L 2002-2006 Nissan Altima S Sedan 4-Door 2.5L 2002-2006 Nissan Altima SL Sedan 4-Door 2.5L Professional installation would be highly recommended Features ATTENTION: This item doesn't ship to California & Colorado & New York, please confirm before purchase. VEHICLE FITMENT: Compatible with 2002 2003 2004 2005 2006 Altima 2.5L. Please check the product description page below for more references. DIRECT FIT DESIGN: The flange is precisely built to meet standard OE specifications without extra modification, and all installation holes are firmly and exactly fixed with attached gaskets and hardware. HIGHER EFFICIENCY & QUALITY: Internal ceramic substrates contain ample metal catalysts and offer a larger surface area to fully react; Adopt 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. EPA CERTIFIED: EPA Federal Standard Certificated, all AUTOSAVER88's catalytic converters are stamped with an exclusive EPA number on the shell. AUTOSAVER88 offers a 5-year or 50,000 miles limited warranty, for any manufacturer defect. (NOTE: Professional installation would be highly recommended) Package Included 1 X Front Catalytic Converter w/Installation Accessories 1 X Rear Catalytic converter w/Installation Accessories We may pack the item in 2 parcels because the products are shipped from different warehouses, Pls don't worry if you only receive one cat. The other parcel will arrive at you soon. [specification] Specifications Brand YITAMOTOR Certifications OBD I / OBD-II / Federal EPA / Non-CARB Material Stainless steel Restricted States California, New York, Colorado & Maine Fitment Type Direct Replacement Connection Type 2 Bolt Substrate Ceramic Placement on Vehicle Front & Rear Interchange Part Number 0991401, 324202, 642280 Other Part Number 54360,40514,88140,58140 Manufacturer Part Number Y01O09043 Package included 1 X Front Catalytic Converter w/Installation Accessories 1 X Rear 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]