6.6L Duramax L5P Downpipe-Back Exhaust System | Chevy & GMC | 2017–2025
Type: Exhaust Systems
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This downpipe-back exhaust system is built for Chevrolet Silverado and GMC Sierra HD pickups with the 6.6L Duramax L5P. Choose the existing 4-inch or 5-inch configuration for your model-year group.
Vehicle fitment
- 2017–2019 or 2020–2025 Chevrolet Silverado/GMC Sierra 2500HD and 3500HD L5P pickups.
- Not compatible with Cab & Chassis.
Specifications
| Specification | Details |
|---|---|
| Diameter options | 4 inches or 5 inches |
| Construction | 16-gauge stainless steel |
| Layout | Downpipe-back, single side exit |
| Muffler | No muffler included |
| Hardware | Clamps, contour-bent hangers and flanges |
What is included
- Selected exhaust system without a muffler
- Mounting clamps and hangers
Before installation
- Choose the exact year group and diameter available on this product.
- Compatible race tuning is required.
- Check cab, bed and exhaust clearance before final tightening.
For off-road or competition use only where permitted. Follow the supplied installation and tuning instructions.
Frequently asked questions
Can I select a muffler with these variants?
No. The configurations currently offered on this listing do not include a muffler.
Which model years should I select?
Use the 2017–2019 or 2020–2025 group matching your truck. These are the year groups currently offered here.
Important Notes:
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TARIFF NOTICE:
While we ship with all required USMCA/CUSMA paperwork, U.S. Customs or carriers may still apply duties or fees at delivery. For details, see U.S. Customs & Border Protection
Shipping
We strive to provide fast and reliable shipping options for all our customers. For detailed information about our shipping rates, delivery times, and policies, please visit our Shipping Page.
Return Policies
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
- 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.
6.6L Duramax L5P Downpipe-Back Exhaust System | Chevy & GMC | 2017–2025
Vehicle Fitment
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Questions and answers
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