Improve exhaust flow, reduce exhaust gas temperature (EGT) and realize greater power gains with the new ''Full Bore'' driver's side exhaust manifold for the 2001-06 GM Duramax.You may not know it, but the factory driver's side manifold is pinched down to allow clearance for the steering shaft, which actually isn't required. As a result, this manifold flows only 80% of the passenger side manifold. The BD Full Bore exhaust manifold restores full exhaust flow to match the passenger side, and is a direct, bolt-in replacement for the factory part (GM gasket required). The BD Full Bore manifold is made from high-silicon ductile iron to resist cracking from high temperature and vibration, and is even tapped to accept the most popular EGT probes.
The BD Big Bore exhaust manifold is a great compliment to BD's new SuperMax turbo upgrade kit and stainless steel X-Hale exhaust systems.
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