Fits: 2017 thru 2024 Chevy Silverado/GMC Sierra 2500HD/3500HD L5P & 2019-2024 4500HD/5500HD/6500HD L5D Duramax Diesel

Replace the restrictive factory cast parts with Wehrli Custom Fabrication's high-strength, TIG-welded high-flow billet steel components. These manifolds are exhaust port gasket matched and internally divided for optimal flow with OEM or ported cylinder heads. 

Features:

• Fully TIG welded, CNC machined billet steel
  
• Finished in Black Ceramic Coat rated for 1800ºF
• Enhanced exhaust flow, improve turbo spool up & lower EGT's
• Increased power and economy
• 1/8 NPT port (and optional plug) included in driver side manifold for installation of EGT or drive pressure sensor
• Fully compatible with OEM up-pipes or WCFab 2" Stainless Up Pipes
• No tuning required

Includes:

• Driver & Passenger Billet Exhaust Manifolds
  
• Manifold, EGR flange & manifold to up pipe gaskets
• ARP 12pt. fasteners, washers & assembly lube

Notes:

• Only compatible with OEM style up pipes or WCFab 2" Stainless Up Pipes
  
• 3-5 business day processing time before shipment

*NOT LEGAL FOR SALE OR USE IN CALIFORNIA. THE MANUFACTURE, SALE, OFFER FOR SALE, OR INSTALLATION OF THIS PRODUCT MAY ALSO BE ILLEGAL NATIONWIDE UNDER THE FEDERAL CLEAN AIR ACT (42 U.S.C. § 7522(A)(3))*

*This product is ONLY designed for closed course racing where it is legal to do so. Any other use will be in violation of local, state, and federal laws. We are not responsible for unlawful use of this product.