GM Duramax L5P - Down-pipe Back Race Exhaust System (2017-2023)
Type: Exhaust Systems | Fits: GM Duramax
Unleash maximum airflow and aggressive performance with the Black Bandit Downpipe-Back Race Exhaust System. Built for 2017β2023 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax L5P engine, this stainless steel exhaust replaces restrictive factory emissions components to deliver stronger exhaust flow, lower exhaust gas temperatures (EGTs), and sharper throttle response.
The factory exhaust system can restrict airflow and limit performance, especially on tuned or heavily worked trucks. The Black Bandit Downpipe-Back Race Exhaust eliminates these restrictions by replacing the catalytic converter and DPF system with a larger-diameter stainless exhaust. The result is improved airflow, cooler engine operation under load, and a more aggressive exhaust note that matches the power of the L5P Duramax.
Vehicle Fitment
- 2017β2023 Chevrolet Silverado 2500HD / 3500HD β 6.6L Duramax L5P
- 2017β2023 GMC Sierra 2500HD / 3500HD β 6.6L Duramax L5P
Note: Not compatible with Cab & Chassis trucks.
Technical Specifications
| Product Type | Downpipe-Back Race Exhaust System |
| Pipe Size Options | 4" or 5" |
| Material | High-Grade Stainless Steel |
| Configuration | Downpipe-Back System |
| Hangers | OE-Style Mounting Hangers |
| Muffler Option | Optional muffler available |
| Bungs | None (race design) |
| Application | Off-road / competition use only |
| Tuning Requirement | Race tuning required after installation |
Whatβs Included
- Black Bandit stainless steel downpipe-back exhaust system (4" or 5")
- OE-style hangers pre-installed
- Clamps and installation hardware
- Optional muffler configuration available
Features
- Available in 4" or 5" stainless steel exhaust configurations
- Downpipe-back design removes restrictive factory emissions components
- High-grade stainless steel construction for durability and corrosion resistance
- OE-style hangers ensure secure and straightforward installation
- Bung-free race design optimized for maximum exhaust flow
Benefits
- Supports improved horsepower and torque through better exhaust flow
- Helps reduce exhaust gas temperatures during heavy load or towing
- Improves throttle response and turbo efficiency
- Produces a deeper, more aggressive exhaust tone
- Durable stainless construction designed for long-term performance use
Installation Notes
- Direct-fit downpipe-back replacement for factory exhaust.
- Some modifications may be required depending on truck configuration.
- Race tuning required after installation to ensure proper operation.
- Professional installation recommended for best results.
Important Notes:
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Important Notices
- OffβRoad Use Only
Products sold by JS Speed are intended for offβroad use and may be illegal on public roads where emissions or pollutionβcontrol 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 vehicleβs 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.
