BD Diesel Cast Exhaust Manifold - Dodge 6.7L 2008-2012Fully divided pulse manifold made from high silicon ductile iron and designed to withstand extreme temperatures and vibration. Precision slip joints allow the manifold to expand and contract, which reduces cyclic thermal fatigue and greatly increases manifold longevity. Cast Of High Silicon Ductile Iron To Withstand Extreme Temperature Cycling Caused During DPF Regeneration Thick Walled Casting And Integral Slip Joint Prevents Cracking And Exhaust