Are you thinking of replacing your stock C15/3406E turbo with a more reliable and affordable unit? Then you will need a dependable exhaust manifold to mate up to it. BD's exhaust manifolds are constructed of thick walled, durable high-silicon ductile iron which with their 3-piece design will prevent cracking and help reduce future repair costs and down time. The Pulse exhaust flow design directs energy to the dual volute turbine which maximizes spooling response and bottom end power. The T6 mount allows for a variety of turbos that can be installed including BD's own Roadmaster Turbo.