Information High quality chassis partseries products. Made with high strength steel tubing for superior strength and durability. Stable performance, reliable quality and long service life Uniform thickness, no blow holes, slag, cracks, tearing, or incomplete fusion. Measured by specialized inspection tools after welding to make sure assemble hole , bushings insert, and installation sizes are proper. Professional InstallerisHighly Recommended(No Instruction Included) Alignment Highly Recommended After InstallCompatibility Chart For 2004-2013 Nissan Titan 5.6L For 2005-2013 Nissan Armada 5.6L For 2008-2012 Nissan Pathfinder 5.6 For 2005-2010 Infiniti QX56 5.6LPackage Content 4PCSManifold Catalytic Converters