What is included in a full delete kit for L5P Duramax?

A full L5P delete kit typically includes an EGR delete kit or block-off plate, a DPF and DEF delete pipe, an ECM unlock and recalibration solution, and a tuner such as HP Tuners or EZ Lynk to clear codes and disable regen. Many bundles also add a CCV reroute kit and a CAN bus plug so the deleted sensor network stays quiet. Exact contents vary by model year, because the 2020 and later L5P needs a dedicated ECM unlock device that the 2017-2019 trucks do not. Always match the kit to your specific year before ordering.

What years does the L5P Duramax delete kit cover?

The L5P delete kit covers 2017 through 2025, the full run of the 6.6L Duramax L5P in the Chevy Silverado and GMC Sierra 2500 and 3500. The line splits into 2017-2019, 2020-2023, and 2024-2025 fitment windows because the ECM and harness changed across those years. Picking the right window decides which EGR plate, pipe, and unlock hardware ship in the box. A 2018 build and a 2022 build are not interchangeable without the correct parts.

Do I need a tuner with an L5P delete kit?

Yes. The factory ECM is programmed to watch the EGR, DPF, and DEF systems, so once those are gone the controller needs delete-capable tuning or the truck sets codes and enters a derate. A tuner such as HP Tuners or EZ Lynk rewrites the fuel and regen tables so the ECM stops looking for the missing hardware. Running a deleted L5P without the tune is the fastest way to end up in limp mode. The tuner is not optional on this platform.

Does the L5P delete kit require an ECM unlock?

Yes for 2020 and newer. The 2017-2019 L5P uses the earlier ECM path, but the 2020-2023 and 2024-2025 trucks run a revised controller that needs a dedicated unlock device before any delete calibration will load. Without it, the tune cannot be written. The unlock is handled during the tuning phase, and the kit is selected to match your model year so the hardware and the calibration line up.

Is an L5P delete kit legal for street use?

No. Removing emissions control equipment violates federal EPA law and state law in California, Colorado, and Arizona, and can trigger a federal fine of up to 32,500 dollars per vehicle. L5P delete kits from EGR Performance are manufactured and sold strictly for off-road and competition racing use only. Installing this hardware on a truck registered, licensed, or operated on public roads may fail inspection and carry penalties. Each buyer is responsible for complying with all local, state, and federal rules before purchase and installation.

6.6L Duramax L5P Delete Kits (2017–2025) | Chevy & GMC HD

Q: Can you delete a 2024 or 2025 L5P Duramax?

Yes. Deleting a 2024 L5P delete kit or 2025 L5P delete kit requires specialized ECM unlocking hardware alongside the performance delete pipes and EGR plates. The newest L5P calibration pairs with the latest unlock module, so the tune can load cleanly. The hardware itself is the same family of EGR delete, DPF pipe, and CAN termination used across the platform, just matched to the current controller. Confirm the year before you buy so the unlock path lines up.

Q: Do you ship L5P delete kits to Canada?

Yes, we ship L5P delete kits to Canada and across North America from our US warehouses in CA, TX, OH, and NJ. Orders over the border move with the same tracking and the same 45-day return window and 1-year heavy-duty warranty as domestic orders. These kits are sold for off-road and competition use only. Buyers are responsible for understanding how the rules apply where the truck is used, and the hardware is not legal for any vehicle operated on public roads.

Q: What is the difference between a 4 inch and 5 inch L5P delete pipe?

A 4 inch delete pipe keeps exhaust velocity higher and the tone closer to stock, which suits most daily and tow builds. A 5 inch pipe moves more volume for higher horsepower and a deeper sound, and is the popular choice on trucks pushing serious power. Both ship in T304 stainless steel, with or without a muffler, and both need the CCV reroute so oil mist does not coat the compressor wheel once the EGR path is gone.

Q: What does a CAN bus plug do on an L5P delete?

After the EGR, DPF, and DEF modules are removed, the CAN bus plug terminates the deleted sensor network so the dashboard stays free of phantom codes and warning lights. It closes the loop the ECM no longer needs to see. It is a small but important part of a clean install, because an open CAN circuit is exactly what triggers the dash lights owners dread after a delete.

Q: Is a tuner harness plug kit the same as a CAN bus plug?

No. The CAN bus plug terminates the deleted sensor network on the dash side, while the tuner harness plug kit is a set of weatherproof caps that seal the factory connectors left unplugged after a delete or tuner install. One manages the data network, the other protects the physical connectors from water and salt. They do different jobs and a complete L5P build uses both. Do not substitute one for the other.

L5P Duramax Delete Kits for 2017–2025 Chevy Silverado & GMC Sierra HD

Eliminate extreme active regens, lower Exhaust Gas Temperatures (EGTs), and stop intake soot clogging on your 6.6L Duramax L5P. Engineered specifically for 2017 through 2025 Chevrolet Silverado and GMC Sierra 2500/3500 HD trucks, our complete L5P delete packages intelligently pair precision EGR block-off plates, T304 stainless DPF/DEF delete race pipes, CCV reroute hardware, and mandatory L5P ECM unlock modules with custom delete tuning for single-teardown reliability.

✓ 4 Regional US Hubs (CA, TX, OH, NJ) ✓ 45-Day Return Guarantee ✓ 1-Year Warranty ✓ 24/7 Live Tech Support

Shop L5P Duramax Delete Kits by Model Year

Note: L5P Duramax ECM architecture updated across generations. Select your exact year range to ensure correct ECM unlock modules and harness connectors:

2017–2019 L5P Duramax Deletes

Covers first-generation L5P models. Shipped complete with CNC-machined EGR block-off plates, CAN bus termination plugs, and heavy-duty T304 stainless race piping. You need early-gen ECM unlock calibration modules.

2020–2023 L5P Duramax Deletes

Tailored for mid-cycle L5P updates with revised E41 ECM security architecture. You need to pair with a dedicated ECM swap/unlock hardware to allow seamless off-road delete tuning.

2024–2025 L5P Duramax Deletes

Engineered for late-model Silverado and Sierra HD trucks. Includes CNC-machined EGR block-off plates. You also need late-gen E42 ECM unlock modules.

Shop L5P Deletes by Component Configuration

L5P EGR Delete Kits →

Blocks intake recirculation ports with CNC 6061-T6 billet plates to prevent carbon sludging and lower intake manifold temperatures on the 6.6L L5P.

L5P DPF Delete Pipes →

Mandrel-bent stainless steel race pipes that replace massive under-body filter canisters, eliminating DEF dosing faults and active regens.

L5P Full Bundles w/ Tuners →

The complete single-teardown package: EGR delete, 3-bolt flange DPF race pipe, CCV reroute kit, ECM unlock module, and custom delete tuning.

L5P Engine Architecture & ECM Unlock Notes

The 6.6L Duramax L5P platform represents GM's highest factory horsepower diesel, but its emissions system is heavily guarded by factory ECM encryption. Understanding these technical points ensures a smooth installation:

Mandatory ECM Unlock: Unlike older Duramax models (LLY/LBZ/LMM/LML), the L5P ECM cannot be flashed via standard OBD-II ports without first installing an ECM unlock module or swapping to an unlocked controller.
Downpipe Flange Geometry: L5P race pipes use a heavy-duty 3-bolt flange configuration rather than the V-band clamps found on early LML trucks.
Crankcase Oil Protection: Rerouting the CCV is highly recommended on L5P builds to keep sticky oil film off your turbo compressor wheel after the EGR path is removed.

Why Tens of Thousands of Diesel Owners Trust EGR Performance

EGR Performance: Engineered for Power. Backed for Life.

We manufacture precision-engineered, direct-fit modification solutions built to withstand extreme heat and pressure. Whether you drive a Powerstroke, Cummins, or Duramax, our upgrades deliver real horsepower, lower EGTs, and long-term reliability.

🚀 Free & Fast Shipping Dispatched from regional US hubs (CA, TX, OH, NJ) to get you back on the road fast.

🔄 45-Day Returns Shop risk-free with our hassle-free 45-day return policy on unused hardware.

🛡️ 1-Year Warranty Tested under brutal conditions. Precision-engineered and guaranteed to perform.

🛠️ 24/7 Live Support Real-time tech assistance from fitment verification to post-install tuning.

OFF-ROAD & COMPETITION USE ONLY DISCLAIMER:
All L5P Duramax delete kits, race pipes, and tuning electronics are designed strictly for closed-course racing, competition, and off-road agricultural vehicles. Removing or tampering with factory emissions control devices on public highways is illegal under federal EPA laws and state regulations (including California, Colorado, and Arizona). Unlawful street use may trigger federal civil penalties. Not for sale or use on public roads.

EGR DELETE KITS

CCV PCV REROUTE KIT

DPF DELETE KITS

DIESEL TUNERS

Why Does Your 6.6L Duramax L5P Need a Delete Kit?

The 6.6L Duramax L5P operates under aggressive factory emissions controls. Over time, these systems restrict airflow, consume extra fuel, and create severe engine failure risks:

1. Soot & Carbon Choking the Intake

The factory EGR recirculates soot-heavy exhaust back into the intake manifold, coating intake runners, throttle bodies, and EGR valves in thick sludge. Short trips in cold climates accelerate carbon loading dramatically, dropping throttle response and engine power.

2. DPF Clogging & Active Regens

The DPF traps exhaust soot until the ECM triggers active regenerations, dumping raw fuel into the exhaust to burn off soot above 1,200°F. Frequent low-load driving prevents regens from completing, leading to severe filter clogging and de-rate / limp mode.

3. Cooler Thermal Fatigue & Hydrolock

Exhaust gases exceeding 1,400°F pass through the L5P EGR cooler housing. Repeated heating cycles crack internal core tubes, causing coolant loss, white exhaust smoke, and hydrolock engine destruction if coolant enters the cylinders.

What Can an L5P Delete Kit Solve?

Eliminates EGR Failures permanently: CNC-machined 6061-T6 billet aluminum plates cap cooler ports. High-temperature Viton O-rings maintain leak-free sealing through thousands of thermal cycles, preventing intake sludging and coolant leaks for good.
Restores Exhaust Flow & Drops EGTs: Mandrel-bent 4-inch T304 stainless steel race pipes replace restrictive filter canisters with smooth, full-flow tubing. Reducing exhaust backpressure drops EGTs significantly under heavy towing loads.
Removes DEF System Dependencies: Eliminates the SCR catalyst, DEF tank dosing injectors, and failure-prone sensors, removing warning messages and limp-mode derates from your dash.
Seals Open Electrical Looms: Weatherproof CAN bus plugs and multi-piece harness plug kits seal exposed factory connectors against water, mud, and road salt corrosion.

Shop L5P Delete Kits for Chevrolet & GMC

Always confirm your exact model year, downpipe flange (3-bolt flange for L5P), and ECM unlock configuration before placing your order:

4" DPF Delete Pipe & EGR Delete Kit w/ Downpipe & CAN Bus Plug (2017–2019)

Fitment: 2017–2019 Chevy Silverado 2500/3500 HD & GMC Sierra 2500/3500 HD (6.6L Duramax L5P).

Solves: Complete hardware solution featuring a 4-inch T304 stainless steel DPF pipe, integrated downpipe, CNC-machined EGR block-off plates, and a CAN Bus termination plug to eliminate regens, EGT spikes, and intake clogging on early L5P trucks.

4" DPF Delete Pipe & EGR Cooler Delete Kit (2017–2022)

Fitment: 2017–2022 Chevy Silverado 2500/3500 HD & GMC Sierra 2500/3500 HD (6.6L Duramax L5P).

Solves: Covers first-gen and mid-cycle L5P models with updated cooler routing. Includes mandrel-bent T304 stainless DPF delete piping, complete EGR cooler bypass assembly with Viton O-rings, and heavy-duty TIG welds for leak-free reliability.

2024–2025 Late-Model L5P Full Delete & ECM Unlock Bundles

Fitment: 2024–2025 Chevy Silverado HD & GMC Sierra HD (6.6L Duramax L5P).

Solves: Bundles late-gen ECM unlock hardware, CAN termination plugs, and weather-sealed tuner harness caps with 3-bolt flange race pipes to unlock off-road calibrations on the latest GM HD trucks.

Why Choose EGR Performance?

The Industry Standard for High-Performance Diesel Reliability

Premium Quality & Field Testing: Engineered from aircraft-grade 6061-T6 aluminum and T304 stainless steel to withstand extreme heat and pressure under heavy towing.

20 Years of Diesel Expertise: Two decades of hands-on modification expertise providing proven solutions for Powerstroke, Cummins, and Duramax platforms.

Industry-Leading Precision: Direct bolt-on fitment engineered to meet or exceed strict heavy-duty standards for flawless alignment.

Real Track & Towing Results: Proven track record with thousands of customer builds delivering lower EGTs, restored horsepower, and total reliability.

OFF-ROAD & COMPETITION USE ONLY DISCLAIMER: All 6.6L Duramax L5P delete hardware, race pipes, and tuning electronics are designed exclusively for closed-course competition, racing, and off-road agricultural vehicles. Removing or tampering with factory emissions control devices on public highways is illegal under federal EPA laws and state regulations (including California, Colorado, and Arizona). Unlawful street use may trigger federal civil penalties up to $32,500 per vehicle. Not for sale or use on public roads.

Frequently Asked Questions About L5P Duramax Delete Kits & Tuning Solutions

1. What is included in a full delete kit for an L5P Duramax?

The Bottom Line: A complete L5P delete kit includes a CNC billet EGR block-off plate, a T304 stainless DPF/DEF delete race pipe, an ECM unlock device, custom off-road tuning (via HP Tuners or EZ Lynk), a CCV reroute kit, and a CAN bus termination plug.

Exact kit contents vary by generation: 2020+ models require a dedicated ECM unlock module that 2017–2019 trucks do not. Always match your order to your exact model year to ensure seamless single-teardown installation.

2. Can you delete a 2024 or 2025 L5P Duramax truck?

Yes, 100%. Deleting a late-model 2024–2025 L5P Duramax requires specialized ECM unlocking hardware designed for GM's latest controller calibrations.

While the physical hardware (EGR block-off plates, 3-bolt flange race pipes, and CAN termination plugs) remains in the same engineering family, our 2024–2025 packages ship with late-gen ECM unlock modules to ensure calibrations flash clean without fault codes.

3. Do you ship L5P delete kits to Canada?

Yes! We dispatch L5P delete kits directly to Canada and across North America from our strategic US warehouse hubs in California, Texas, Ohio, and New Jersey.

Canadian orders move with dedicated tracking, backed by our standard 45-day return guarantee and 1-year heavy-duty warranty. Buyers are responsible for confirming local off-road regulations before purchase.

4. What model years do L5P Duramax delete kits cover?

Full Platform Coverage (2017–2025): Our lineup covers every Chevrolet Silverado HD and GMC Sierra 2500/3500 HD powered by the 6.6L Duramax L5P across three fitment windows:

2017–2019 L5P: Early ECM architecture with standard unlock calibrations.
2020–2023 L5P: Mid-cycle controller update requiring dedicated ECM unlock devices.
2024–2025 L5P: Late-model security architecture shipping with current-gen unlock modules and CAN termination.

5. Do I need a custom tuner with an L5P delete kit?

Yes, custom tuning is mandatory. The factory ECM actively monitors EGR flow, DPF pressure differentials, and DEF dosing. Attempting to run physical delete hardware without recalibrating the ECM will trigger permanent Check Engine Lights (CEL) and immediate engine de-rate (limp mode). Delete tuners (HP Tuners or EZ Lynk) rewrite fuel and regen tables to keep the truck running clean.

6. What is the difference between a 4-inch and 5-inch L5P delete pipe?

4-Inch Delete Pipes: Maintain higher exhaust gas velocity, provide optimal chassis clearance, and keep exhaust tone refined (ideal for daily tow rigs).
5-Inch Delete Pipes: Move maximum exhaust gas volume, drop high-load EGTs fastest, and produce a deep, aggressive diesel rumble on higher-horsepower builds.
Note: Both sizes feature heavy-duty 3-bolt downpipe flanges and high-grade T304 stainless steel construction.

7. What does a CAN bus plug do on an L5P delete?

After emissions control modules (EGR, DPF, DEF) are physically unplugged, the CAN bus plug terminates the deleted sensor network loop. This prevents phantom data errors from circulating on the CAN network, keeping your instrument cluster completely free of warning lights and soft fault codes.

8. Is a tuner harness plug kit the same as a CAN bus plug?

No, they perform two entirely different jobs:

CAN Bus Plug: Terminates the digital sensor network on the ECM side to eliminate dashboard fault routines.
L5P Tuner Harness Plug Kit: A multi-piece set of weather-sealed caps that physically cap exposed OEM harness connectors under the truck against water, mud, and road salt corrosion.
Rule: A clean, long-lasting L5P build requires both items.

9. Does an L5P delete kit require an ECM unlock?

Yes. While 2017–2019 models use earlier OBD-II flashing strategies, 2020–2023 and 2024–2025 L5P Duramax trucks feature encrypted controller security that requires a dedicated ECM unlock module before custom delete calibrations can be written. All our platform bundles include the correct year-specific unlock path.

10. Are L5P Duramax delete kits legal for street use?

No. Removing or tampering with factory emissions controls on public highways is illegal under federal EPA law and state regulations (including California, Colorado, and Arizona), carrying civil penalties up to $32,500 per vehicle. All L5P delete components from EGR Performance are strictly manufactured and sold for closed-course competition, off-road racing, and agricultural use only.

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from 627 reviews

EGR Delete for 1986-1995 Ford F150 F250 2.8L 4.9L 5.0L 5.8L 7.5L Bronco EGR Simulator Eliminator Delete

88 Mustang GT

Have to say that I like the quality of the product and ease of installation. I’ve had it in for a little over a week now and I’ve driven several hundred miles with no issues whatsoever. Certainly worth it!

Ed Palmer

EGR Delete for 1986-1995 Ford F150 F250 2.8L 4.9L 5.0L 5.8L 7.5L Bronco EGR Simulator Eliminator Delete

02/17/2026