Dealing with a bad catalytic converter or manifold on your truck or SUV? This Walker Ultra EPA 16479 unit is a direct-fit, bolt-on replacement designed to get you back on the road and keep you emissions-compliant. It's an integrated assembly, meaning the catalytic converter and exhaust manifold are all one piece, just like the original. This specific part fits a bunch of vehicles: the Nissan Titan (2004-2013), Nissan Armada/Pathfinder Armada (2004-2013), Nissan Pathfinder (2008-2012), and the Infiniti QX56 (2005-2010). It's built to meet EPA requirements for OBDII vehicles (1996 and newer), but definitely check your own state's rules on aftermarket converters. It's made with strong, durable materials, has thick flanges, and includes heat shields where needed. Super important: before you buy, double and triple-check that this part number matches your specific vehicle's year, make, model, and engine. Using the right part means an easier installation and reliable performance.