Wehrli 100121 3 inch V-Band Style Down Pipe | 2011-2015 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Features:

• Full 3-inch diameter for improved flow
• Replaces restrictive factory crushed down pipe
• Increases turbo efficiency and spool time
• Compatible with factory or drop-in turbos
• Designed for 2011–2014 style V-band exhausts
• High-quality stainless steel construction
• Precision fitment for easy installation
• Improves exhaust sound and performance
• Great upgrade for tuned or deleted trucks
• Welded V-band flange ensures tight seal
• Made in the USA by Wehrli Custom Fabrication
• Not compatible with 2015.5+ stock 3-bolt flange

Let Your Turbo Breathe The Way It Should

If you're still running the stock crushed down pipe on your 2011–2015 Duramax, you're choking your turbo without even realizing it. The Wehrli 3-Inch V-Band Style Down Pipe is a simple yet powerful upgrade that completely transforms how your truck breathes and responds. By opening up the exhaust path with a full 3-inch diameter, you’re allowing your turbo to spool quicker and more efficiently, which translates to better throttle response and cooler exhaust temps. Whether you’re towing heavy, daily driving, or tuned for performance, this down pipe delivers noticeable gains without a complicated install. It’s designed to fit trucks running a 2011–2014 style V-band exhaust, making it ideal for anyone ditching the limitations of the stock system. You’ll notice a deeper, cleaner exhaust note too, one that actually sounds like the power you're making. It's a must-have for drivers who want their truck to run smoother, sound better, and pull harder.

Built To Match Factory Fit With Performance In Mind

The Wehrli 100121 3-Inch V-Band Down Pipe is precision-engineered for the 2011–2015 GM Silverado and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax LML. Crafted from high-quality stainless steel, this down pipe replaces the restrictive factory version with a mandrel-bent 3-inch alternative that significantly improves exhaust flow. It’s compatible with factory turbos and drop-in replacements, giving you flexibility in how you build your truck. This version uses a V-band style flange that aligns with 2011–2014 exhaust configurations, so if you’re running a 2015.5 or newer system with a 3-bolt flange, you’ll either need an earlier-style exhaust or Wehrli’s alternate flange model. The V-band design ensures a reliable, leak-resistant seal and simplifies installation with a clean, secure fit. This down pipe is an ideal choice for those upgrading airflow to support tuning or reduce backpressure in high-demand driving. It’s a functional, well-built solution that balances performance gains with a factory-like install experience.

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

Notes:

• Replaces factory crushed down pipe for better flow
• Compatible with factory or drop-in style turbos
• Designed for 2011–2014 V-band style exhaust systems
• Will not fit 2015.5+ trucks with 3-bolt flange exhaust
• 2015.5+ trucks must convert to earlier style exhaust
• Alternatively, use Wehrli part number WCF100705 for 3-bolt systems
• V-band flange design offers a tight, leak-free seal
• Professional installation recommended for best fitment
• Intended for off-road or performance applications
• Not CARB approved, check emissions regulations locally