BD Diesel 01-16 Chevrolet/GMC 2500HD/3500HD 6.6L Duramax Passenger Side Exhaust ManifoldExperience performance and durability with the enhanced Duramax exhaust manifolds, specifically designed for the 2001 2016 6. 6L Duramax engines. The BD upgraded manifolds remove the flow restriction found on the 2001 2006 model driver's side manifold and efficiently transfer exhaust gases to the turbocharger. Crafted with precision, the BD manifolds feature robust, 65% thicker designed castings constructed from high silicon ductile iron to combat