Product Description
Upgrade your 2001-2004 LB7 Duramax with the WEHRLI CUSTOM FAB WCF100478 S300 SINGLE TURBO INSTALL KIT, a premium performance solution engineered for serious horsepower, airflow efficiency, and durability. Designed by Wehrli Custom Fabrication, this kit allows LB7 Duramax owners to replace the restrictive factory IHI turbo setup with a larger BorgWarner S300-frame turbocharger (turbo sold separately) for significantly improved airflow and performance potential.
Built with high-quality fabricated aluminum components and precision-engineered hardware, this kit includes a high-flow intake system, upgraded intercooler piping, billet Y-bridge intake, stainless braided oil lines, and a heavy-duty turbo pedestal. The result is a complete airflow upgrade path capable of supporting large horsepower builds, improved turbo response, and stronger towing or competition performance.
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Key Features
- Designed for S300 frame turbochargers
- Fabricated aluminum 4" intake system with performance air filter
- High-flow billet 3" Y-bridge intake upgrade
- Mandrel bent 3" aluminum intercooler piping
- Heavy-duty T4 turbo pedestal mounting system
- Stainless steel braided oil feed and drain lines
- High-temperature turbo downpipe connection
- Designed for high horsepower LB7 builds
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
Important Installation Note: A forward-facing thermostat housing is typically required for proper clearance due to the larger intake system included in this kit.
Frequently Asked Questions
Does this kit include the turbocharger?
No. The Wehrli WCF100478 kit is designed to install an S300 frame turbo but the turbocharger itself must be purchased separately.
What horsepower levels can this kit support?
Depending on turbo selection and supporting modifications, S300 turbo setups on LB7 Duramax engines can support builds well beyond 600 horsepower.
Is fabrication required for installation?
This kit is engineered as a bolt-on solution for S300 turbo upgrades, though professional installation is recommended for best results.
Will this work with factory intercooler piping?
No. The kit replaces the factory intercooler piping with larger 3" mandrel-bent aluminum charge pipes for improved airflow.
Is this kit emissions legal?
This product is intended for off-road or competition use and may not be emissions compliant in all states.
Specifications for WEHRLI CUSTOM FAB WCF100478
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100478 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 60 lbs |
| Package Dimensions | 36 x 24 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 |
