3" inch Stainless 3 Bolt Flange Style Down Pipe

Features:

• Fits 2015.5–2016 LML Duramax 6.6L
• Full 3-inch stainless steel construction
• Replaces restrictive crushed factory downpipe
• Designed for 3-bolt flange turbo connection
• Compatible with factory or drop-in turbos
• Includes heat wrap and clamps
• Improves exhaust flow and turbo response
• Helps reduce backpressure and EGTs
• Durable and corrosion-resistant material
• Precision-fit for easy installation
• Made in the USA by Wehrli Custom Fabrication
  

Make Your Turbo Work Smarter Not Harder

If you’re running a 2015.5–2016 LML Duramax, upgrading your downpipe is one of the most effective ways to unlock better airflow and performance. The Wehrli 100705 3-inch Stainless Down Pipe is a direct replacement for the factory crushed unit, giving your turbo the breathing room it’s been waiting for. With a smooth, unrestricted path, you’ll experience a faster spool-up, cooler exhaust temps, and stronger throttle response. Whether you tow, daily drive, or just want to push your build further, this upgrade delivers a big impact without needing major modifications. It’s built to work seamlessly with your factory turbo or any factory-style drop-in unit that uses the 3-bolt flange. Plus, the included heat wrap and clamps make it a complete, clean install. This is one of those upgrades that pays off every time you hit the throttle.

Designed To Improve Flow And Withstand The Heat

The Wehrli 100705 Down Pipe is built from precision-formed 3-inch stainless steel to provide long-term durability and performance for your 2015.5–2016 Duramax LML. This pipe is designed to replace the OEM downpipe that uses a restrictive crushed bend, which limits exhaust flow and turbo efficiency. By utilizing a full 3-inch diameter and smooth transitions, this downpipe allows for faster evacuation of exhaust gases, helping to reduce turbo lag and lower EGTs under load. It features a 3-bolt flange that mates directly to the factory turbo or compatible aftermarket drop-in units. All necessary hardware is included, including heat wrap and clamps, to manage under-hood temps and maintain installation integrity. This pipe is not compatible with the earlier 2011–2014 v-band style connections, so proper application fitment is key. Whether you're aiming for performance gains or improved drivability, this component is engineered to perform.

Fits: 2015.5, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Designed for 2015.5–2016 GM 6.6L LML Duramax models only.
• Fits trucks with the 3-bolt flange style exhaust connection.
• Does not fit 2011–2014 trucks with v-band connection, use part number WCF100704 for those models.
• Compatible with factory turbos and drop-in replacement turbos that retain the 3-bolt flange.
• Replaces restrictive factory downpipe to improve exhaust flow.
• Includes heat wrap and clamps for installation and thermal protection.
• Fabricated from high-quality stainless steel for long-term durability and corrosion resistance.
• Helps reduce exhaust gas temperatures and improve turbo efficiency.
• Professional installation recommended for best fitment and performance.