Product Description
The WEHRLI CUSTOM FAB WCF100570 S400 / STOCK TWIN (COMPOUND) TURBO KIT is engineered to transform the 2001-2004 LB7 Duramax into a high-horsepower compound turbo diesel platform capable of extreme airflow, towing performance, and race-level power. Developed by Wehrli Custom Fabrication, this premium compound turbo system pairs a large atmospheric S400 frame turbo with the factory LB7 turbocharger to create a highly efficient staged turbocharging system.
Compound turbo systems dramatically increase boost efficiency and airflow by allowing the small factory turbo to spool quickly while the large S400 turbo provides massive airflow at higher RPM. The Wehrli WCF100570 kit features fabricated high-flow charge piping, heavy-duty turbo mounting brackets, stainless oil lines, and precision-engineered hardware to simplify installation and deliver unmatched durability.
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Key Features
- Designed for compound turbo systems using factory turbo + S400 atmospheric turbo
- High-flow fabricated aluminum charge piping
- Heavy-duty S400 turbo mounting bracket system
- Precision fabricated hot side piping
- Stainless braided oil feed and drain lines
- Mandrel bent intercooler piping for improved airflow
- Complete hardware and installation components included
- Supports extreme horsepower LB7 Duramax 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 Note: The Wehrli compound turbo kit requires an S400 turbocharger (sold separately). The factory turbocharger is retained as the high-pressure turbo in this compound configuration.
Frequently Asked Questions
Does this kit include the S400 turbocharger?
No. The Wehrli WCF100570 kit provides all installation components but the S400 turbocharger must be purchased separately.
How much horsepower can this compound turbo setup support?
Depending on turbo sizing and supporting modifications, compound turbo systems on LB7 Duramax engines commonly support builds exceeding 700-900 horsepower.
Is this kit designed for towing or racing?
Compound turbo systems are ideal for both heavy towing and high horsepower performance builds due to improved boost efficiency and reduced exhaust drive pressure.
Will this work with factory fuel systems?
This kit can be installed on stock fuel systems but higher horsepower setups will require upgraded injectors, lift pumps, and tuning.
Is professional installation recommended?
Yes. Due to the complexity of compound turbo systems, professional installation is recommended for proper fitment and performance.
Specifications for WEHRLI CUSTOM FAB WCF100570
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100570 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 85 lbs |
| Package Dimensions | 36 x 24 x 16 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 |
