1. What Is an L5P Delete Kit?
A typical L5p Duramax delete kit combines an EGR delete kit, a DPF delete pipe, and sometimes a CCV reroute and a CAN BUS plug, plus tuner and tuning that recalibrates the computer so the truck runs without codes.
This guide explains how the L5P emissions system works, where the law stands in 2026, why owners delete, the kits we carry for every budget (including popular 2021 chevy 2500 delete kit setups), how to install them, and risks.
2. L5P Duramax Emission System Architecture: What You're Working With
The 2017+ L5P 6.6L Duramax engine has an EGR system (valve plus cooler) that feeds a portion of exhaust back into the intake to cut NOx; a DOC (diesel oxidation catalyst) starts the exhaust cleanup; a DPF (diesel particulate filter) traps soot and periodically burns it off during regenerations; and an SCR catalyst with DEF (diesel exhaust fluid) injection converts remaining NOx downstream. Sensors and dosing modules tie the chain together, and the engine computer watches it constantly.
Two things matter for delete work. First, the DPF and SCR sit inline in the exhaust, so deletes replace that section with straight pipe, changing backpressure and sound. Second, the L5P's electronics are more tightly integrated than earlier Duramax generations, which is why current kits include CAN BUS plugs to prevent warning lights and countdown messages after the hardware is gone.
3. Is an L5P Delete Kit Legal in 2026?
Short answer: no, not for trucks driven on public roads. Removing or disabling emissions equipment has been federally illegal in the US since the Clean Air Act, and that has not changed in 2026.
4. Why L5P Duramax Diesel Owners Consider a Delete Kit
Costly emissions system failures. The primary motivation is eliminating expensive repairs and replacements of components like the DPF and EGR, which fail with age and use. "Advantages: removing costly components that are very expensive to repair and replace" (reddit.com/r/Diesel). A single DPF or SCR-side repair can run four figures, and DEF sensor and doser failures are chronic complaints on high-mileage L5Ps.
Improved performance and fuel economy. Removing the restrictive hardware and enabling custom tuning frees up power, sharpens throttle response, and often improves mileage. "D/T increased my mileage. I think there will be less issues as I continue to own" (reddit.com/r/Duramax).
Prevent carbon buildup. Some owners believe the EGR system, even when working correctly, feeds soot back into the intake and builds carbon that shortens engine life. "It's the egr that destroys your motor" (reddit.com/r/Duramax). It is a strongly held view in the community, though not every technician agrees the L5P suffers the way older engines did.
5. L5P Duramax Delete Kit Options
The kits below cover the full L5P delete kit line we have. Every card works like a mini product page: pick your variant from the dropdown and the image, price, and buy button update to match, so you can configure your exact truck (year, pipe diameter, CAN BUS plug color, and so on) before clicking through. Use code DPF15 at checkout for 15% off. The struck-through price is the list price for the selected variant and the orange price is your price after the code. Questions on fitment? Email service@dpfexhaust.com or click the blue chat box on the bottom right.
DPF/EGR Delete + CAN BUS Plug Kit + Downpipe Exhaust
- EGR delete, 3.5'' downpipe, and DPF delete pipe in one kit.
- CAN BUS plug kit stops delete-related dash warnings.
DPF/DEF/EGR Delete + CAN BUS Plug Kit + EZ LYNK tuner
- EZ LYNK Package DPF/DEF/EGR delete kit, and CAN BUS plugs are included.
- EZ LYNK is the most advanced custom-tuned platform with cloud updates.
DPF/EGR/CCV Delete + Downpipe Exhaust
- For owners who want a CCV delete as well, this DPF/EGR/CCV delete kit is for you。
- Kit comes with a downpipe exhaust as well; our downpipe-back exhaust must pair with our downpipe.
DPF/EGR/CCV Delete
- DPF/EGR/CCV delete bundle for 2017-2024 L5P trucks, DOES NOT come with Downpipe.
EGR Delete + Downpipe Exhaust
- EGR delete kit with 3.5'' downpipe only. We have customers specifically asked for this bundle, so here we are.
6. Installation Guide
- How to Install EGR Delete Kit for Duramax L5P - Step-by-Step Guide
- How to Install 2017+ L5P 6.6 Duramax DPF Delete Downpipe Exhaust - Step-by-Step Guide
- How to Install 2017+ L5P CCV Reroute/Delete Kit - Step-by-Step Guide
- How to Install EZ Lynk - Step by Step Guide
7. Risks, Tradeoffs, and Responsible Use of an L5P Delete Kit
Legality and inspections. Deleting emissions systems is illegal and can lead to fines, failed inspections, and resale headaches in areas with strict emissions laws. "Cons: it's illegal and expensive to do" (reddit.com/r/Diesel). Know your state's testing rules before you start.
Smell and noise. A deleted L5P usually has a stronger exhaust smell and can be louder, especially with a straight pipe. "I too have L5P and I couldn't imagine if I didn't, I had a lot of emissions issues tho" (reddit.com/r/Duramax). Owners who battled emissions faults for years tend to accept the trade.
Warranty and cost. Deleting voids the vehicle's warranty, and a proper job is not cheap. Depending on the extent of the delete and whether it is done professionally or DIY, parts, tuning, and labor commonly run $2,500 to $9,000. "You're gonna have to pay 6k to get a legit tune that's not copied and just for your truck" (reddit.com/r/Duramax). A copied tune file is the fastest way to turn a delete into a problem.
Responsible use: keep every factory part and a copy of the stock tune so you can revert.
If you have any questions, you can also click the blue chat button at the bottom right of our website to contact us.
Hope this article helps you.
Have a great day! 🙂
