BD Diesel 6.7L Cummins Exhaust Manifold Dodge is a fully divided pulse manifold manufactured from high-silicon ductile iron and engineered to withstand severe temperatures and vibration. Best for both stock and performance trucks. Modern technology is used which utilizes pulse flow for quicker turbo spool and increased power. Precision slip joints permit the manifold to expand and contract, which reduces cyclic thermal fatigue and greatly increases manifold longevity.