Product Description
Improve airflow and turbo performance on your 2004.5-2005 Duramax with the WEHRLI CUSTOM FAB WCF100301 4" INTAKE KIT WITH AIR BOX STAGE 2. Designed specifically for the LLY Duramax platform, this high-flow intake system replaces the restrictive factory intake components with a large diameter 4-inch mandrel-bent intake tube and a performance air box designed to maximize airflow while maintaining engine bay cleanliness and protection.
The Wehrli Custom Fabrication Stage 2 intake kit is engineered to improve turbo spool-up, increase airflow efficiency, and support higher horsepower levels for tuned or modified trucks. Built with high-quality materials and precision fabrication, this intake kit offers a clean installation while delivering noticeable improvements in throttle response and turbocharger efficiency.
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Key Features
- Large diameter 4" intake tube for improved airflow
- High-flow performance air filter
- Stage 2 enclosed air box design
- Improves turbo response and throttle performance
- Supports higher horsepower and tuned engines
- Direct bolt-on installation for LLY Duramax trucks
- High-quality Wehrli Custom Fabrication construction
Fitment
- 2004.5 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LLY
- 2005 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LLY
- 2004.5 GMC Sierra 2500HD / 3500HD 6.6L Duramax LLY
- 2005 GMC Sierra 2500HD / 3500HD 6.6L Duramax LLY
Installation Note: This intake kit installs using factory mounting points and does not require cutting or permanent modifications to the vehicle.
Frequently Asked Questions
What benefits does a 4" intake provide on an LLY Duramax?
A larger intake tube allows the turbocharger to pull in more air with less restriction, improving turbo response, airflow efficiency, and overall engine performance.
Will this intake kit work with aftermarket tuning?
Yes. This intake system works well with tuned Duramax trucks and supports additional airflow demands created by performance tuning and turbo upgrades.
Does this intake include the air filter?
Yes. The Wehrli Stage 2 intake kit includes a high-flow reusable air filter designed to maximize airflow while maintaining filtration.
Is this intake kit difficult to install?
No. Installation is straightforward and typically takes about 30-60 minutes using basic hand tools.
Is the intake kit emissions compliant?
This product is intended for off-road or competition use and may not be emissions compliant in all areas.
Specifications for WEHRLI CUSTOM FAB WCF100301
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100301 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 12 lbs |
| Package Dimensions | 20 x 14 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 |
