High Performance Exhaust Manifold Kit Detroit 60 Series With EGR Kit includes PAI designed Exhaust Manifold which is 1PC assembly including front,rear and center pieces.Kit packed with hardware and gaskets.PAI 1PC Designed Exhaust Manifold. It is sold as an assembled kit that includes front, rear and center pieces as a single unit.PAI 1PC Design Replaces The Following OE Manifolds Front 23537115/Center 23537114/Rear 23537116