Upgrade the Exhaust Manifolds and Up Pipes on your 2017-2025 Duramax to WCFab's Billet Exhaust Manifold & 2" Stainless Up Pipe Kit.

WCFab’s Billet Exhaust Manifolds with EGR Riser Flange replaces 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.

Includes new gaskets, ARP 12PT fasteners, up pipe bolt kit, and assembly lube for easy install. Finished in Black Ceramic Coat rated for 1800ºF.

WCFab's Up Pipe Kit replaces the lightweight, leak prone, 1 5/8" OEM up pipes with heavy duty 11 gauge 2" Stainless up pipes. HD Stainless Bellows that will not crack and leak like OEM. Increase Turbo spool-up and decrease EGT's.

NO Tuning required, bolt on! Will fit on stock truck no other modifications or upgrades necessary.

Also fits 2019+ L5D Duramax (4500/5500/6500) Medium Duty Trucks.

Saves $150 vs. buying individually.

• 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, EGR flange, and manifold to up pipe
• Includes ARP 12PT Fasteners and washers for installation to cylinder head
• 1/8 NPT port (and optional plug) included in driver side manifold for installation of EGT or drive pressure sensor
• Includes ARP Up Pipe Bolt Kit
• Passenger Side Up Pipe
• Driver Side Up Pipe
• Up Pipe Gaskets (4)
• No tuning required