Product Description
Improve airflow and maximize turbo efficiency with the WEHRLI CUSTOM FAB WCF100300 4" INTAKE KIT WITH AIR BOX STAGE 2 for the 2001-2004 LB7 Duramax. Designed and manufactured by Wehrli Custom Fabrication, this high-performance intake system replaces the restrictive factory intake with a large diameter 4-inch aluminum intake tube and sealed air box to deliver cooler, denser airflow to your turbocharger.
The Stage 2 intake system features a precision-fabricated aluminum intake tube, high-flow air filter, and sealed air box designed to isolate intake air from engine bay heat. By reducing restriction and improving airflow to the turbo, the WCF100300 intake helps improve throttle response, turbo spool time, and overall engine efficiency for towing, daily driving, or high-performance LB7 builds.
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Key Features
- Large diameter 4" aluminum intake tube
- High-flow performance air filter
- Stage 2 sealed air box design
- Improves airflow and turbocharger efficiency
- Reduces intake restriction compared to factory system
- Improves throttle response and turbo spool
- Durable powder-coated aluminum construction
- Designed specifically for LB7 Duramax trucks
Fitment
- 2001 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
- 2002 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
- 2003 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
- 2004 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
- 2001-2004 GMC Sierra 2500HD / 3500HD 6.6L Duramax LB7
Installation Note: This intake system is designed as a direct bolt-on upgrade using factory mounting locations and does not require tuning for installation.
Frequently Asked Questions
What does the Stage 2 intake system improve?
The Stage 2 system improves airflow to the turbocharger, which can help improve throttle response, turbo spool speed, and overall engine efficiency.
Is tuning required after installing this intake?
No. The Wehrli WCF100300 intake kit installs without requiring tuning. However, tuning can further optimize airflow improvements.
Will this intake increase horsepower?
While the primary benefit is improved airflow, many owners notice small horsepower gains and improved turbo response depending on other modifications.
Is the intake filter reusable?
Yes. The included high-flow filter is serviceable and can be cleaned and reused using standard air filter cleaning kits.
Will this work with aftermarket turbo upgrades?
Yes. The large 4" intake design works well with both factory and upgraded turbocharger setups including common S300 conversions.
Specifications for WEHRLI CUSTOM FAB WCF100300
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100300 |
| Product Type | 4" Intake System with Air Box |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 12 lbs |
| Package Dimensions | 22 x 14 x 12 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 |
