Product Description
Increase airflow and eliminate factory restrictions with the WEHRLI CUSTOM FAB WCF100528 3.5" HIGH FLOW INTAKE HORN & INTERCOOLER PIPE KIT for the 2003-2007 5.9L Cummins. This premium intake upgrade from Wehrli Custom Fabrication replaces the restrictive factory intake horn and intercooler piping with a high-flow 3.5" system designed to dramatically improve boost flow, throttle response, and horsepower potential.
Constructed from precision-fabricated aluminum, the Wehrli intake horn system provides smoother airflow transitions and significantly increased airflow capacity compared to stock components. Paired with a large-diameter intercooler pipe upgrade, this kit improves turbo efficiency while reducing boost pressure losses across the intake tract.
This upgrade is ideal for Cummins owners running upgraded turbos, performance tuning, or towing setups that require improved airflow and intake efficiency. The system installs using factory mounting locations and includes all necessary hardware for a clean, professional installation.
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Key Features
- High-flow 3.5" fabricated aluminum intake horn
- Large-diameter intercooler pipe upgrade
- Improves airflow and boost efficiency
- Reduces intake restriction compared to factory horn
- Designed for high horsepower Cummins builds
- Supports upgraded turbochargers and tuning
- Precision fabricated aluminum construction
- Direct bolt-on installation
Fitment
- 2003 Dodge Ram 2500 5.9L Cummins
- 2003 Dodge Ram 3500 5.9L Cummins
- 2004 Dodge Ram 2500 5.9L Cummins
- 2004 Dodge Ram 3500 5.9L Cummins
- 2005 Dodge Ram 2500 5.9L Cummins
- 2005 Dodge Ram 3500 5.9L Cummins
- 2006 Dodge Ram 2500 5.9L Cummins
- 2006 Dodge Ram 3500 5.9L Cummins
- 2007 Dodge Ram 2500 5.9L Cummins
- 2007 Dodge Ram 3500 5.9L Cummins
Installation Note: Designed for trucks with factory intercooler configuration. Performance tuning and upgraded turbo systems will see the largest gains from this airflow upgrade.
Frequently Asked Questions
What does an upgraded intake horn do on a 5.9 Cummins?
The intake horn directs air into the intake manifold. A larger high-flow horn improves airflow volume and reduces restriction, which helps increase horsepower and boost efficiency.
Will this kit increase horsepower?
Yes. While the exact gains depend on turbo and tuning modifications, improving intake airflow can support higher horsepower levels and improved throttle response.
Does this kit require tuning?
No tuning is required for installation, but trucks with performance tuning will benefit the most from the increased airflow.
Is this compatible with aftermarket turbo upgrades?
Yes. The 3.5" intake horn and intercooler piping are designed to support higher airflow demands from larger turbochargers.
Is this a bolt-on upgrade?
Yes. The Wehrli WCF100528 kit is designed as a direct bolt-on upgrade using factory mounting locations.
Specifications for WEHRLI CUSTOM FAB WCF100528
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100528 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 12 lbs |
| Package Dimensions | 24 x 16 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 |
