GM Duramax LML Down-pipe Back Race Exhaust (2015.5-2016)
Type: Exhaust Systems | Fits: GM Duramax
Unlock the performance potential of your 2015.5ā2016 Duramax 6.6L with thisĀ 4" or 5" Downpipe-Back DPF Delete Exhaust System. Built from T409 stainless steel, this system replaces restrictive factory componentsāincluding the catalytic converter and DPF filterādelivering maximum exhaust flow, cooler EGTs, and more power. Ideal for off-road competition use, this system is built tough and designed to fit seamlessly with OEM-style components.
Vehicle Fitment
- ā 2015.5ā2016 GMC Sierra 2500/3500HD (6.6L Duramax LML)
- ā 2015.5ā2016 Chevrolet Silverado 2500/3500HD (6.6L Duramax LML)
- ā Not for Cab & Chassis trucks
- ā Not compatible with V-Band setups
- ā Fits only OEM-style 3-bolt flange turbo connections
Specifications
| Feature | Details |
|---|---|
| Pipe Size Options | 4" or 5" stainless steel |
| Material | T409 stainless steel (corrosion-resistant) |
| Design | Downpipe-back, straight-pipe exhaust system |
| Fitment | OEM-style 3-bolt flange & OE-style hangers |
| Muffler Options | No muffler (straight pipe); optional 4" muffler available |
| Bungs | None (competition-style design) |
| Requirements | Requires race tuning; for off-road use only |
Key Features
- T409 Stainless Steel Piping: Durable and corrosion-resistant for long-lasting performance.
- Downpipe-Back Exhaust System: Replaces restrictive components for maximum flow and power.
- OEM-Style 3-Bolt Flange: Ensures proper fitment with the factory turbo flange.
- OE-Style Hangers: Factory-style hangers simplify installation and provide a secure fit.
- Straight Pipe Design: Maximum exhaust flow with no muffler for competition use.
- No Bungs: Simplifies design for race applications, removing emissions-related connections.
Performance Benefits
- Enhanced Exhaust Flow: Removes the catalytic converter and DPF filter for smoother airflow.
- Boosted Power & Efficiency: Increases horsepower, torque, and throttle response.
- Reduced EGTs: Keeps your engine cooler under heavy load.
- Competition-Ready: Designed specifically for race and off-road environments.
Installation Notes
- Direct downpipe-back replacement system.
- Race tuning required after installation to ensure correct performance.
- Optional 4" muffler available for quieter operation.
- Professional installation recommended for best fitment and tuning results.
Important Notes:
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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.
