Balance your exhaust flow for greater power and lower EGTs!

Made with high-silicon ductile iron, the Full Bore is a direct, bolt-in replacement for the factory exhaust manifold. It is pre-drilled and tapped to accommodate the most popular EGT probes.

In the stock version of the driver’s side exhaust manifold on the '01-'10 Chevy 6.6L Duramax engine, the manifold is unnecessarily squeezed down to allow room for the steering shaft. This setup constricts front two cylinders on driver’s side, allowing only 80% of the flow that passes through the passenger side cylinders. This imbalance can lead to a build-up of heat between the two banks.

Aftermarket exhaust manifolds try to fix this by increasing the internal bore size of their units compared to the port size on the cylinder head. This change cools the exhaust inside of the manifold itself, but the temperature in the combustion chamber increases due to the loss of turbo boost. This decrease of turbo drive pressure energy and false lowering of EGT readings is bad for engine performance. Good drivers monitor their EGT closely to make sure their engine isn't in danger of heat damage. By changing the base temperature of the readings, drivers are not able to accurately monitor their EGTs and protect their engine.

To address these challenges, BD Diesel has developed a Full Bore exhaust manifold that restores exhaust flow balance, improves power, and reduces EGT’s inside the combustion chamber. Because the full bore exhaust manifolds have the same internal bore size, turbo drive pressure is maintained.

Improve the performance of your truck--and save hundreds of dollars--by using BD's manifold rather than other aftermarket kits.