2001-2008 Duramax Full Bore Exhaust Manifold.
You may not know it, but the factory driver’s side exhaust manifold is pinched down to allow for steering shaft clearance, which actually isn’t required. As a result, this manifold only flows 80% of the passenger side. BD’s Full Bore exhaust manifold restores exhaust flow balance, improving power and reducing Exhaust Gas Temperature. Made from high-silicon ductile iron, the Full Bore is a direct, bolt-in replacement for the factory manifold and is even drilled and tapped to accept the most popular Exhaust Gas Temperature probes.
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