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BD Diesel Exhaust Pulse Manifold w/ T4 Mount - Dodge 1998.5-2018 5.9L/6.7L - bdd1045995-T4 missing-image 3906cc Suspension::Air Compressor Systems 1998-2001Aftermarket 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