Product Description
Improve airflow and intake efficiency on your Duramax with the WEHRLI CUSTOM FAB WCF100721 3.5IN INTAKE HORN WITH PCV PORT. Designed specifically for the 2017-2019 L5P Duramax platform, this high-flow intake horn replaces the restrictive factory intake elbow to increase airflow capacity and improve turbocharger efficiency.
Manufactured by Wehrli Custom Fabrication, this precision-machined intake horn features a larger 3.5-inch internal diameter to reduce intake restriction and support higher horsepower builds. The integrated PCV port allows seamless connection to the factory crankcase ventilation system while maintaining proper engine ventilation and reliability.
This upgrade is ideal for truck owners running larger turbochargers, upgraded tuning, or performance intake systems. By improving intake airflow before the turbocharger, the WCF100721 helps optimize boost response, throttle efficiency, and overall engine performance.
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Key Features
- High-flow 3.5" intake horn design
- Direct replacement for restrictive factory intake elbow
- Integrated PCV port for factory crankcase ventilation connection
- Improves airflow to turbocharger
- Supports higher horsepower Duramax builds
- Precision-machined aluminum construction
- Designed for performance and durability
Fitment
- 2017 Chevrolet Silverado 2500HD 6.6L Duramax L5P
- 2017 Chevrolet Silverado 3500HD 6.6L Duramax L5P
- 2018 Chevrolet Silverado 2500HD 6.6L Duramax L5P
- 2018 Chevrolet Silverado 3500HD 6.6L Duramax L5P
- 2019 Chevrolet Silverado 2500HD 6.6L Duramax L5P
- 2019 Chevrolet Silverado 3500HD 6.6L Duramax L5P
- 2017-2019 GMC Sierra 2500HD 6.6L Duramax L5P
- 2017-2019 GMC Sierra 3500HD 6.6L Duramax L5P
Frequently Asked Questions
What does an upgraded intake horn do on a Duramax?
An upgraded intake horn increases airflow capacity entering the turbocharger, reducing restriction and improving turbo efficiency and engine performance.
Does this intake horn retain the factory PCV system?
Yes. The WCF100721 includes a dedicated PCV port so the factory crankcase ventilation system can be retained.
Will this improve horsepower on a stock truck?
While power gains vary, improving airflow to the turbocharger can enhance throttle response and help support additional performance upgrades.
Is this a bolt-on installation?
Yes. The intake horn is designed as a direct replacement for the factory intake elbow with standard hand tools.
Is tuning required after installing this part?
No tuning is required for installation, though performance tuning can maximize the benefits of improved airflow.
Specifications for WEHRLI CUSTOM FAB WCF100721
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100721 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Material | Machined Aluminum |
| Finish | Raw / Powdercoat depending on option |
| Shipping Weight | Approx. 4 lbs |
| 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 |
