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01-16 GM 6.6L Duramax WCFAB Billet Exhaust Manifolds

WCFab’s 2001-2016 Duramax Billet Exhaust Manifolds replace the restrictive factory cast parts with high-strength, TIG-welded high-flow billet steel components designed to enhance exhaust flow characteristics, improving turbo spool up, lowering EGTs and increasing power and economy. These manifolds are exhaust port gasket matched and internally divided for optimal flow with OEM or ported cylinder heads. Outlet locations allow full compatibility with OEM style up pipes and are designed to be paired with WCFab’s 2” Stainless High-Flow Up Pipes (sold separately) for optimized performance. Includes new gaskets, ARP 12PT fasteners, and assembly lube for easy install (up pipe fastener kits sold separately). Finished in Black Ceramic Coat rated for 1800ºF.

No tuning required.

Compatible with LB7, LLY, LBZ, LMM, and LML engines.

Replaces the following GM Part Numbers: 12637647, 12624683

- Fully TIG Welded, CNC machined billet steel exhaust manifolds

- Finished in Black Ceramic Coat rated for 1800ºF

- Includes new gaskets for manifold to cylinder head and manifold to up pipe

- Includes ARP 12PT Fasteners and washers for installation to cylinder head. Up pipe fastener kits sold separately as part WCF100240.

- 1/8 NPT ports (and optional plugs) included in driver and passenger side manifold for installation of EGT or drive pressure sensors

- No tuning required.

This product cannot ship to California.

WCFAB: WCF100363

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