Ditch the restrictive factory downpipe and upgrade to our 3” Stainless Steel Downpipe — engineered to deliver improved airflow, lower EGTs, and a cleaner, more efficient exhaust path for your 2011–2015 LML Duramax.
Featuring a true 3” internal diameter from end to end, this downpipe offers superior CFM (cubic feet per minute) flow compared to the stock unit. Constructed from high-quality 304 stainless steel and wrapped in fiberglass heat insulation, this emission-friendly downpipe is equipped with all three OEM sensor bungs, making it a perfect direct-fit solution.
Key Features:
- Full 3” Internal Bore – Smooth, unrestricted flow for improved performance
- 304 Stainless Steel Tubing – Corrosion-resistant and built to last
- TIG-Welded, Jig-Built Construction – Ensures precision fitment and strength
- Zinc-Coated Flanges – Enhanced durability and rust protection
- 3 Factory Emissions Sensor Bungs – Fully emissions compatible
- Fiberglass Heat Wrap – Helps reduce under-hood temps and manage EGTs
- Downpipe Support Tab – For secure mounting and long-term reliability
Vehicle Fitment:
- 2011–2016 Chevy/GMC Duramax 6.6L (LML)
- Designed for trucks with V-Band style exhaust flange
Note:
2015.5–2016 LML models can be converted to this V-Band style downpipe; however, exhaust modification is required.