GM Duramax LML 3" Down-pipe (2011-2015)
Type: Down-Pipe | Fits: GM Duramax
Upgrade your 2011–2015 Duramax with this 3" stainless steel downpipe designed to increase exhaust flow and unlock more turbo efficiency. Compared to the restrictive factory pipe, this high-flow replacement delivers up to 20% better airflow, helping to reduce exhaust gas temperatures (EGTs) and enhance overall performance. Ideal for off-road and competition use.
Vehicle Fitment
- ✅ 2011 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD 6.6L Duramax LML
- ✅ 2012 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD 6.6L Duramax LML
- ✅ 2013 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD 6.6L Duramax LML
- ✅ 2014 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD 6.6L Duramax LML
- ✅ 2015 Chevrolet Silverado/GMC Sierra 2500HD & 3500HD 6.6L Duramax LML
- ❌ Not compatible with Cab & Chassis trucks
- ❌ Not compatible with late 2015 models using a 3-bolt flange
Specifications
| Feature | Details |
|---|---|
| Pipe Diameter | 3" Stainless Steel |
| Flow Improvement | Up to 20% more flow than factory pipe |
| Heat Management | Includes heat wrap for reduced under-hood temps |
| Performance Use | Maximizes exhaust flow for competition and off-road setups |
| Compatibility Notes | Does not affect emissions systems, not for Cab & Chassis |
Key Features
- 3" stainless steel tubing for long-term durability and performance
- Provides up to 20% better flow than the restrictive factory downpipe
- Heat-wrap included to retain heat and lower engine bay temperatures
- Improves turbocharger efficiency with quicker spool and reduced EGTs
- Direct-fit design for Silverado and Sierra Duramax pickups (LML engines)
Performance Benefits
- Improved Turbo Response: Faster spool-up for better throttle reaction
- Lower EGTs: Keeps your Duramax cooler under heavy load and towing
- Durability: Stainless steel construction resists corrosion and extreme heat
- Competition-Ready: Built for maximum flow in race and off-road applications
Installation Notes
This downpipe is a direct-fit replacement and installs using factory-style connections. Heat wrap is included to help control temperatures. Professional installation is recommended to ensure proper fitment, especially on tuned or modified trucks.
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Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
