Product Description
Improve turbo efficiency and exhaust flow with the WEHRLI CUSTOM FAB WCF100704 3IN STAINLESS DOWN PIPE V-BAND STYLE for the 2011-2015 6.6L LML Duramax. Designed and fabricated by Wehrli Custom Fabrication, this high-performance downpipe replaces the restrictive factory unit with a smooth mandrel-bent stainless steel design that dramatically improves exhaust flow leaving the turbocharger.
The factory downpipe on the LML Duramax can restrict airflow and increase exhaust backpressure, especially on trucks running upgraded turbos or performance tuning. The Wehrli WCF100704 downpipe solves this problem with a 3-inch mandrel bent stainless steel construction and a precision V-band turbo flange for secure, leak-free installation. The improved flow helps lower exhaust gas temperatures (EGTs), improve turbo spool characteristics, and support higher horsepower builds.
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Key Features
- 3-inch mandrel-bent stainless steel downpipe
- V-band turbo flange design for secure sealing
- Improves turbocharger exhaust flow
- Helps reduce exhaust gas temperatures
- Supports high horsepower Duramax builds
- Precision fabrication from Wehrli Custom Fabrication
- Direct replacement for restrictive factory downpipe
Fitment
- 2011 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
- 2012 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
- 2013 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
- 2014 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
- 2015 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
- 2011-2015 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML
Installation Note: This downpipe is commonly used on performance or emissions-modified trucks. Professional installation is recommended to ensure proper alignment and clearance around the firewall and transmission tunnel.
Frequently Asked Questions
What benefits does a larger downpipe provide?
A larger downpipe reduces exhaust backpressure coming off the turbocharger, allowing the turbo to spool more efficiently and reducing exhaust gas temperatures.
Is this downpipe made from stainless steel?
Yes. The Wehrli WCF100704 is constructed from high-quality stainless steel to provide corrosion resistance and long-term durability.
Does this part require tuning?
This part itself does not require tuning, but many trucks running this upgrade are paired with performance tuning or other exhaust modifications.
Will this fit a stock turbo?
Yes. This downpipe is designed to work with the factory turbocharger using the V-band connection on the LML Duramax.
Is this emissions compliant?
This product is typically intended for off-road or competition use and may not be emissions legal in certain states.
Specifications for WEHRLI CUSTOM FAB WCF100704
| Specification | Details |
|---|---|
| Brand | Wehrli Custom Fabrication |
| Part Number | WCF100704 |
| UPC | Not Listed by Manufacturer |
| GTIN | Not Listed |
| Shipping Weight | Approx. 10 lbs |
| Package Dimensions | 30 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 |
