Description Duramax Balancing Big Bore Exhaust Manifold. Makes it easy for your engine to exhale. Driver`s side full bore exhaust manifold for the Duramax balances your engine power, reduces cylinder load, reduces exhaust temperature, exhaust backpressure and improves fuel economy. The stock manifold: • Only flows 80% of the passenger side manifold• 3 cylinders only operate at 80% capacity & load others down• No access to measure exhaust temperature The BD manfilold: • Flow matches the passenger side manifold and balances the engines exhaust pressure.• Maintains consistent exhaust pressure and temperature on both sides of the engine. Contains Exhaust temperature probe port. BD uses a high silicon Ductile iron that prevents cracking from heat expansion and vibrations. Manifold gaskets required.
