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 T6 mount allows for a variety of turbos that can be installed including BD's own Roadmaster Turbo.