Product Description
The WEHRLI CUSTOM FAB WCF100190 2001-2004 LB7 DURAMAX 4 INTAKE KIT WITH AIR BOX is a premium airflow upgrade for early LB7 trucks that need more than the restrictive factory plastic intake system can deliver. Built around a high-flow 4-inch fabricated aluminum intake pipe and a durable enclosed air box, this kit is designed to help your 6.6L Duramax breathe easier under load, improve turbo response, and deliver a cleaner, more aggressive engine tone when you get into the throttle.
For performance-minded LB7 owners, this kit checks the right boxes: high-quality aluminum construction, enclosed filtration, smooth airflow path, dry filter assembly, and true bolt-on installation. Whether you are cleaning up the engine bay, replacing aging stock intake parts, or building a better foundation for supporting mods, the WCF100190 gives your truck a sharper look and stronger airflow package without requiring tuning.
Key Benefits:
- High-flow 4-inch intake piping for improved airflow to the turbo
- Fabricated aluminum air box and lid for durability and better underhood appearance
- Helps improve throttle response, horsepower, torque, and intake efficiency
- Draws cooler air through the inner fender area
- Includes dry filter, hardware, silicone boot, seals, and stainless T-bolt clamps
- Simple bolt-on installation with basic hand tools
- Made in the USA
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 GMC Sierra 2500HD/3500HD 6.6L Duramax LB7
- 2002 GMC Sierra 2500HD/3500HD 6.6L Duramax LB7
- 2003 GMC Sierra 2500HD/3500HD 6.6L Duramax LB7
- 2004 GMC Sierra 2500HD/3500HD 6.6L Duramax LB7
What’s Included:
- 4-inch fabricated aluminum intake pipe
- Fabricated aluminum air box with lid
- Dry air filter assembly
- Outerwear-style pre-filter cover / enclosed filtration setup
- Silicone boot
- O-ring seal
- Stainless steel T-bolt clamps
- Installation hardware
FAQ
Will this intake fit all 2001-2004 Duramax trucks?
This intake kit is built for 2001-2004 GM Silverado and Sierra 2500HD/3500HD trucks equipped with the 6.6L LB7 Duramax. It is not intended for later LLY, LBZ, LMM, or newer applications.
Does this kit require custom tuning?
No. The WCF100190 is designed as a bolt-on intake upgrade and is commonly installed without tuning.
What makes this better than the stock intake?
The factory intake system is more restrictive and less durable than this fabricated setup. The Wehrli kit increases airflow, improves turbo response, supports better intake temperatures, and offers a much cleaner underhood appearance.
Is the filter enclosed?
Yes. This kit includes an air box enclosure with lid to help protect the filter and support cooler incoming air compared to an exposed open-filter design.
Can this product be shipped to California?
This intake is commonly listed as not for shipment to California. Always confirm the latest destination restrictions before finalizing the listing.
| Brand | WEHRLI CUSTOM FAB |
| Part Number | WCF100190 |
| UPC | Not publicly listed |
| GTIN | Not publicly listed |
| Shipping Info | Free Shipping at CPP Diesel; CPP listed dimensions: 16 in x 16 in x 24 in. WCFab availability commonly states 3-5 business days for select stocked colors and 10-15 business day lead time on other colors. |
| Construction | 4-inch 14-gauge aluminum intake pipe with 10-gauge aluminum air box and lid |
| Filter Type | Dry air filter |
| Installation | Bolt-on installation with basic hand tools |
| Country of Origin | Made in USA |
| Prop 65 | Warning applies. See https://www.P65Warnings.ca.gov |
