Product Description
Upgrade the reliability and performance of your L5P Duramax with the WEHRLI CUSTOM FAB WCF100373 BILLET EXHAUST MANIFOLD KIT. Designed specifically for the 2017-2022 GM 6.6L Duramax L5P, this premium kit replaces the factory cast manifolds with precision-machined billet components engineered for improved durability, thermal stability, and exhaust flow.
The Wehrli Custom Fabrication billet manifold system is built to handle the extreme heat cycles and stress associated with high-performance diesel applications. Unlike factory cast manifolds that are prone to cracking and warping, the billet design provides superior structural integrity and consistent sealing across the cylinder head surface. This complete kit includes high-quality ARP mounting hardware and premium exhaust gaskets, ensuring a secure installation capable of supporting towing, performance upgrades, and high horsepower builds.
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Key Features
- Precision-machined billet exhaust manifolds
- Improved exhaust flow compared to restrictive factory manifolds
- Increased durability under extreme heat cycles
- Includes high-quality exhaust gaskets
- Premium ARP hardware for secure installation
- Designed specifically for 6.6L Duramax L5P engines
- Ideal upgrade for towing, performance builds, and long-term reliability
Fitment
- 2017 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2018 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2019 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2020 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2021 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2022 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax L5P
- 2017-2022 GMC Sierra 2500HD / 3500HD 6.6L Duramax L5P
Frequently Asked Questions
Why upgrade the factory L5P exhaust manifolds?
Factory manifolds can warp or crack under extreme heat cycles. The billet Wehrli manifolds offer superior strength and sealing reliability for performance or heavy towing applications.
Does this kit include installation hardware?
Yes. The WCF100373 kit includes premium ARP mounting hardware along with high-quality exhaust manifold gaskets for a complete installation.
Will these manifolds increase horsepower?
While the primary benefit is durability and improved exhaust flow, many builds may experience improved turbo response and overall engine efficiency.
Is professional installation recommended?
Yes. Exhaust manifold replacement requires access to cylinder head mounting surfaces and torque-critical hardware, so professional installation is recommended.
Are these compatible with factory turbochargers?
Yes. The manifolds are designed to work with the factory L5P turbocharger configuration and most aftermarket turbo upgrades.
Specifications for WEHRLI CUSTOM FAB WCF100373
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100373 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 18 lbs |
| Package Dimensions | 18 x 12 x 10 inches |
| Shipping Method | UPS / FedEx Ground |
| Prop 65 Warning | This product may contain chemicals known to the State of California to cause cancer or reproductive harm. For more information visit https://www.P65Warnings.ca.gov |
