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GM Duramax L5P - 3.5" Down-pipe (2017-2023)
Type: Down-Pipe | Fits: GM Duramax
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Regular price
$357.50
-24%
Unlock more power and efficiency from your 2017–2023 Chevrolet Silverado & GMC Sierra 2500/3500HD 6.6L Duramax L5P with this 3.5" turbocharger downpipe upgrade. By fully removing the Diesel Oxidation Catalyst (DOC), this pipe maximizes exhaust flow directly from the turbo for improved performance, lower EGTs, and better turbo response—perfect for off-road and competition use.
Vehicle Fitment
- ✅ 2017–2023 Chevrolet Silverado 2500/3500HD 6.6L Duramax L5P
- ✅ 2017–2023 GMC Sierra 2500/3500HD 6.6L Duramax L5P
- ❌ Not compatible with Cab & Chassis models
Specifications
| Feature | Details |
|---|---|
| Pipe Size | 3.5" Stainless Steel Piping |
| Flow Improvement | 20% better flow compared to factory downpipe |
| Finish & Heat Management | Includes heat wrap for reduced engine bay temps and improved heat retention |
| Emissions | Fully removes DOC (Diesel Oxidation Catalyst) |
| Flange Type | 4-bolt flange, two studs pre-installed |
| Application | Competition / off-road use only |
| Compatibility Notes | 2020+ models may require hanger adjustment |
Key Features
- 3.5" Stainless Steel Piping for durability and unrestricted flow.
- 20% Better Flow than the restrictive OEM downpipe.
- Heat Wrap Included to reduce engine bay temperatures.
- Greater Heat Retention to improve turbo efficiency.
- DOC Removal: Completely eliminates the Diesel Oxidation Catalyst for maximum airflow.
- Competition-Ready Design: Built for off-road and racing applications.
Performance Benefits
- Freer exhaust flow directly from the turbocharger.
- Quicker turbo spool-up and sharper throttle response.
- Lower exhaust gas temperatures (EGTs) for improved reliability under load.
- Increased overall power and efficiency for off-road performance setups.
Installation Notes
- Direct-fit design with 4-bolt flange and pre-installed studs.
- On 2020+ trucks, minor hanger adjustments may be necessary.
- Requires custom tuning for proper function and performance.
- Professional installation is strongly recommended.
Important Notes:
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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.
GM Duramax L5P - 3.5" Down-pipe (2017-2023)
Regular price
$357.50