GM Duramax 6.6L Downpipe-Back Race Exhaust (2011-2015)
Type: Exhaust Systems | Fits: GM Duramax
Boost the performance of your 2011ā2015 Duramax 6.6L with this Downpipe-Back Race Exhaust System. Designed for off-road and competition use, it removes restrictive factory components to maximize airflow, reduce exhaust gas temperatures, and improve efficiency. Built from durable stainless steel, this system offers lasting reliability and noticeable gains in power.
Vehicle Fitment
- ā 2011ā2015 Chevrolet Silverado 2500HD/3500HD 6.6L Duramax LML
- ā 2011ā2015 GMC Sierra 2500HD/3500HD 6.6L Duramax LML
- ā Not compatible with Cab & Chassis models
- ā Not compatible with late 2015 models with a 3-bolt flange
Specifications
| Feature | Details |
|---|---|
| Pipe Diameter | 4" or 5" (Stainless Steel) |
| Material | High-grade stainless steel |
| Design | Downpipe-back, straight-through |
| Tuning Required | Yes ā race tuning software required |
| Hangers | OE-style for secure, factory-style fit |
| Muffler Option | Compatible with optional 4" or 5" muffler |
Key Features
- Removes catalytic converter and DPF for maximum flow
- Available in 4" or 5" stainless steel piping
- Straight-through design enhances airflow efficiency
- OE-style hangers for secure and straightforward installation
- Built for off-road and competitive applications
- No bungs, keeping design simple and flow optimized
Benefits
- Increased horsepower and throttle response
- Lower exhaust gas temperatures for engine protection
- Improved fuel efficiency under heavy load and towing
- Long-lasting durability with stainless steel construction
Important Notes:
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Your satisfaction is important to us. If you wish to return an item or request a refund, please review the terms and conditions outlined in our Returns Policy.
Important Notices
- OffāRoad Use Only
Products sold by JS Speed are intended for offāroad use and may be illegal on public roads where emissions or pollutionācontrol 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 vehicleās 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.
