BD's two-piece offset pulse exhaust manifold for '07.5-'12 Dodge Cummins Chassis/Cab applications is cast from high-silicon ductile iron which can withstand extremely high temperatures, as well as the additional weight created by bigger single or twin turbo systems.
Horsepower creates heat - pure and simple. On a high-output engine like the Dodge/Cummins, high exhaust gas temperature (EGT) is enough to cause the stock exhaust manifold to crack.
Two expansion joints allow the manifold to expand and contract without cracking or exhaust leaks.
Manifold is pre-drilled with a 1/8 NPT port for an EGT probe.