WCFAB 2001-2016 Duramax Billet Exhaust Manifold Kit w/ Gaskets & ARP HardwareWCFab 2001 2016 Duramax Billet Exhaust Manifolds replace the restrictive factory cast parts with high strength, TIG welded high flow billet steel components. Outlet locations allow full compatibility with OEM style up pipes and are designed to be paired with our 2 Stainless High Flow Up Pipes (sold separately) for optimized performance. Fully TIG Welded, CNC machined billet steel exhaust manifolds Exhaust port gasket matched and internally divided for
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