BD Diesel Performance 1045987 Pulse Exhaust Manifold for 03-07 Dodge 5.9L Replaces Cummins # 3967995, 3943871 & 3943875 High-silicon ductile iron . Pre-drilled for pyrometer probe Quicker turbo spool up . Reduced back-pressure Fully divided pulse manifold design. Increased power Reduced back-pressure . Designed to withstand extreme temperatures and vibration