The BD Diesel Exhaust Manifold is a must have performance upgrade for your 2007-2015 Dodge Cummins 6.7L. Made from high-silicon ductile iron, these heavy-duty exhaust manifolds with built-in expansion joints can withstand extreme temperature cycling without cracking. Thanks to there fully divided pulse manifold design, users will notice quicker spool times and low drive pressures which lead to an overall increase in performance.