2001-2004 Duramax Billet Exhaust Manifold & Stainless Up Pipe Kit with Gaskets and ARP Hardware (WCF100174)

Billet steel exhaust manifolds for the 2001-2004 LB7 Duramax, paired with Wehrli's 2" stainless high-flow up pipes. The factory cast manifolds are restrictive and crack; these are TIG-welded billet, gasket-matched at the ports and internally divided so they flow well on stock or ported heads. New gaskets, ARP 12-point hardware and assembly lube are in the box.

Outlet locations match the OEM up pipe positions, so the manifolds work with factory-style up pipes as well as the included Wehrli pipes. Both manifolds carry 1/8" NPT ports with plugs for EGT or drive pressure sensors. Finished in black ceramic coat rated to 2000 F. Replaces GM 12637647, 12624683 and 97224587.

Part Number: WCF100174

• Fully TIG-welded, CNC machined billet steel exhaust manifolds
• Internally divided and exhaust port gasket matched
• Includes Wehrli 2" stainless high-flow up pipes
• New manifold and up pipe gaskets included
• ARP 12-point fasteners and washers included
• 1/8" NPT ports with plugs on both manifolds for EGT or drive pressure sensors
• Black ceramic coat rated to 2000 F
• Replaces GM 12637647, 12624683, 97224587
• Made in USA

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