Product Description
The WEHRLI CUSTOM FAB WCF100262 4IN DOWN PIPE is engineered specifically for 2004-2007 Dodge Ram 5.9L Cummins trucks running a high mount S400 turbo and 2nd Gen style exhaust manifold. This high-flow mandrel bent exhaust downpipe improves turbo efficiency by reducing exhaust restriction and allowing the larger S400 turbocharger to operate more efficiently under high boost and high horsepower conditions.
Constructed from heavy-duty steel with precision mandrel bends, this downpipe is designed to clear common high mount S400 turbo configurations used in performance and competition Cummins builds. The increased 4-inch diameter improves exhaust gas evacuation, lowers drive pressure, and helps maximize the power potential of S400-based turbo systems.
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Key Features
- Large diameter 4-inch exhaust downpipe
- Designed specifically for high mount S400 turbo setups
- Compatible with 2nd Gen style Cummins exhaust manifolds
- Mandrel bent construction for maximum exhaust flow
- Improves turbo efficiency and reduces drive pressure
- Heavy duty fabrication for high horsepower diesel builds
- Ideal for performance, towing, and competition trucks
Fitment
- 2004 Dodge Ram 2500 / 3500 5.9L Cummins
- 2005 Dodge Ram 2500 / 3500 5.9L Cummins
- 2006 Dodge Ram 2500 / 3500 5.9L Cummins
- 2007 Dodge Ram 2500 / 3500 5.9L Cummins (5.9L only)
Fitment Note: Designed for trucks equipped with a high mount S400 turbocharger and 2nd generation style Cummins exhaust manifold conversion. Additional exhaust components may be required depending on the turbo and exhaust system configuration.
Frequently Asked Questions
What turbo setups is this downpipe designed for?
This downpipe is designed for Cummins trucks running a high mount S400 turbocharger paired with a 2nd Gen style exhaust manifold conversion.
Will this work with the factory turbo?
No. This downpipe is specifically designed for aftermarket high mount S400 turbo setups and will not fit factory turbo configurations.
Does this improve horsepower?
While the downpipe itself does not create horsepower, it significantly improves exhaust flow which helps turbochargers operate more efficiently in high performance applications.
Is fabrication required?
In most 2nd Gen turbo conversion setups this pipe installs as part of a custom or performance exhaust system and may require minor adjustments depending on the build.
Is this emissions compliant?
This product is intended for off-road or competition vehicles and may not be emissions compliant in certain regions.
Specifications for WEHRLI CUSTOM FAB WCF100262
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100262 |
| Product Type | Turbo Downpipe |
| Diameter | 4 Inch |
| Turbo Compatibility | High Mount S400 Turbo |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approximately 12 lbs |
| Package Dimensions | 28 x 12 x 8 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 |
