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BD Diesel Cast Exhaust Manifold - Dodge 6.7L 2008-2012 - bdd1045965 import_2022_03_21_012537 -cc Drivetrain::Valve Bodies 2005-2014 JeepAftermarket exhaust manifolds that increase the internal bore size of their units compared to the port size on the cylinder head cools the exhaust inside the manifold only, but, the temperatures inside the combustion chamber is higher because of less turbo boost. This has a negative effect on engine performance as it decreases turbo drive pressure energy and falsely lowers EGT readings. EGT is normally monitored by the driver to determine cylinder