Product Description
Improve turbo efficiency and exhaust flow on your LML Duramax with the WEHRLI CUSTOM FAB WCF100705 3IN STAINLESS DOWN PIPE. Designed specifically for 2015.5-2016 Chevrolet and GMC 6.6L LML Duramax trucks, this high-quality stainless steel downpipe replaces the restrictive factory turbo outlet section with a larger, smoother flowing 3-inch mandrel-bent pipe. The result is improved exhaust flow, reduced drive pressure, and better turbocharger performance.
Manufactured by Wehrli Custom Fabrication, this downpipe features precision TIG-welded stainless construction and a durable 3-bolt turbo flange designed to integrate seamlessly with aftermarket exhaust systems. The smooth mandrel bends improve exhaust velocity and reduce turbulence directly after the turbocharger, making it a perfect upgrade for performance-oriented LML Duramax builds.
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Key Features
- Mandrel-bent 3-inch stainless steel construction
- Designed for 2015.5-2016 LML Duramax trucks
- 3-bolt turbo outlet flange for secure installation
- Improves exhaust flow leaving the turbocharger
- Reduces backpressure and improves turbo efficiency
- Precision welded construction for durability
- Compatible with most aftermarket exhaust systems
- Direct performance upgrade for modified Duramax trucks
Fitment
- 2015.5 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
- 2016 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
- 2015.5 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML
- 2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML
Note: This component is typically installed as part of a high-performance exhaust upgrade and may require additional exhaust components depending on your truck’s configuration.
Frequently Asked Questions
What does a larger Duramax downpipe improve?
A larger downpipe improves exhaust flow directly after the turbocharger which reduces backpressure and allows the turbo to spool more efficiently.
Is this downpipe stainless steel?
Yes. The Wehrli WCF100705 downpipe is constructed from high-quality stainless steel for corrosion resistance and long-term durability.
Will this work with aftermarket exhaust systems?
Yes. This 3-inch downpipe is designed to integrate with most aftermarket Duramax exhaust systems that support upgraded turbo outlet piping.
Does installing this downpipe increase horsepower?
While the downpipe alone provides modest gains, it improves turbo efficiency and supports higher horsepower levels when combined with other performance upgrades.
Is tuning required after installation?
Tuning is not always required, but performance tuning may help maximize the benefits of improved exhaust flow.
Specifications for WEHRLI CUSTOM FAB WCF100705
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100705 |
| Material | Stainless Steel |
| Pipe Diameter | 3 Inches |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approx. 12 lbs |
| Package Dimensions | 30 x 10 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 |
