3 inch Stainless Turbo Downpipe

Features:

• Fits 2011–2015 6.6L Duramax LML engines
• Replaces restrictive factory downpipe
• Full 3-inch stainless steel construction
• Compatible with v-band style turbo connections
• Not compatible with 3-bolt flange turbos
• Includes heat wrap and clamps for installation
• Improves exhaust flow and turbo response
• Reduces backpressure for better performance
• Designed for factory or drop-in style turbos
• Durable and corrosion-resistant stainless material
• Direct bolt-on fit for easy installation
• Made for Silverado and Sierra HD trucks

Let Your Duramax Breathe With A Real Upgrade

If you’re looking to ditch the crushed, restrictive factory downpipe and unlock real airflow from your turbo, the Wehrli 3-Inch Stainless Turbo Downpipe is the upgrade your LML Duramax has been waiting for. Built specifically for 2011–2015 Silverado and Sierra 2500HD/3500HD trucks, this downpipe delivers smoother exhaust flow and better turbo response from the moment you hit the throttle. The full 3-inch diameter and high-quality stainless steel construction mean you’re not only improving performance, you’re also adding long-term durability to your setup. Whether you’re towing, daily driving, or building for more boost, this bolt-on replacement eliminates a major bottleneck in your exhaust system. It comes with heat wrap and clamps included, so you’ve got everything needed for a clean and efficient install. Designed to work with factory turbos or drop-in replacements using a v-band flange, this pipe lets your setup breathe like it should. If you want a quick win in performance and drivability, this downpipe makes it easy to feel the difference.

Built To Eliminate Restrictions And Maximize Flow

The Wehrli 100704 3-Inch Stainless Turbo Downpipe is a precision-fit upgrade for 2011–2015 GM 6.6L Duramax LML engines using a v-band style turbo connection. Unlike the stock crushed downpipe, this full 3-inch mandrel-bent stainless steel pipe ensures smooth, unrestricted exhaust flow from the turbo outlet. This results in reduced backpressure, improved turbo spool-up, and lower exhaust gas temperatures, key performance benefits for both tuned and stock applications. The downpipe is designed as a direct bolt-on replacement for trucks running the factory or drop-in style turbos with a v-band flange. It includes high-temp heat wrap and quality clamps to protect surrounding components and maintain a clean engine bay. This kit is not compatible with 3-bolt flange turbos and should only be used with v-band setups. Ideal for performance-minded daily drivers and workhorse builds alike, the Wehrli downpipe offers a simple, effective upgrade that supports improved efficiency and long-term reliability.

 Fitment: 2011, 2012, 2013, 2014, 2015 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Fits 2011–2015 GM Silverado/Sierra 2500HD and 3500HD with 6.6L LML Duramax
• Designed for use with factory or drop-in style turbos using a v-band connection
• Not compatible with 3-bolt flange turbo configurations
• Replaces the restrictive crushed factory downpipe
• Constructed from high-quality 3-inch stainless steel tubing
• Improves exhaust flow and reduces turbo backpressure
• Helps lower EGTs and improve throttle response
• Kit includes heat wrap and clamps for installation
• Direct bolt-on installation with no major modifications required
• Recommended for performance upgrades and improved drivability