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BD Diesel Cast T4 Exhaust Manifold - Dodge 6.7L 2007.5-2018 - bdd1045965-T4 import_2022_03_21_012537 4L (td) (4 Pack) FuelAftermarket 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