aFe Power Exhaust Manifold P/N:46-40024

Open up exhaust flow on the driver's side of your Duramax with the aFe Power BladeRunner Ported Ductile Iron Exhaust Manifold (P/N 46-40024, also written 4640024). It drops in as a direct-fit replacement for the 2001-2016 Chevrolet Silverado 2500 HD, 2001-2016 GMC Sierra 2500 HD, and other GM V8-6.6L (td) diesel trucks — see the Buyer's Guide tab for the full list.

Cast from durable ductile iron, this manifold is designed to move more exhaust gas than the restrictive factory driver-side casting:

• Outflows factory manifolds by 6%: ported design with machined ports matched to the factory gasket openings to maximize exhaust flow.
• Eliminates the factory pinch: removes the flow-restricting pinch of the stock driver-side manifold for improved performance and throttle response.
• Built-in EGT ports: 1/8 NPT exhaust-gas-temperature ports are incorporated into the manifold.
• Easy install: compatible with the factory up-pipes, and manifold mounting hardware is included.

Signs the original manifold may need replacing include cracks, exhaust leaks, or a ticking/whistling sound at the manifold. Made in the United States.