6.6L Duramax L5P Delete Kit with Tuner | DPF, DEF & EGR Delete | Chevy & GMC | 2017–2025
Type: All-In-One Kit
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This L5P package combines tuning, EGR hardware and your selected exhaust for a matched off-road installation.
Vehicle fitment
- 2017–2025 Chevrolet Silverado and GMC Sierra 2500HD/3500HD pickups with 6.6L Duramax L5P.
- Choose the model-year option offered on this product and verify the ECM configuration.
Specifications
| Specification | Details |
|---|---|
| 2017–2023 credits | 4 ECM credits included |
| 2024–2025 credits | 8 ECM credits included |
| 2017–2023 calibration | 5-level SOTF: 0, +50, +75, +100, +150 HP |
| 2024–2025 calibration | Single calibration; no SOTF |
| 2017–2018 unlock tool | Included for the applicable configuration |
| 2019–2023 unlock process | Follow the year- and ECM-specific instructions |
| 2024–2025 E42 unlock | External HP Tuners service required; not included |
What is included
- OBD2 flash tuning interface
- Year-matched ECM tune and licensing credits
- EGR/cooler delete hardware
- The exhaust configuration selected from the options on this product
- CAN BUS plugs for supported 2017–2023 applications
Before installation
- Complete the correct ECM unlock and tuning process before hardware removal.
- For 2024–2025, arrange the separate E42 unlock service; it is not included.
- On 2024–2025 configurations, the NOx and DEF modules must remain connected as directed by the tuning instructions.
For off-road or competition use only where permitted. Follow the supplied installation and tuning instructions.
Frequently asked questions
Is E42 unlocking included?
No. The later-year E42 ECM needs a separate HP Tuners unlock service before tuning.
Does every year support switch-on-the-fly tuning?
No. SOTF applies to the 2017–2023 configuration; the later-year option uses a single calibration.
Does this package include exhaust and EGR parts?
Yes. The selected exhaust and EGR hardware are part of this all-in-one package.
Important Notes:
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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
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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.
