What's a L5P Duramax Delete Pipe?
An L5P Duramax delete pipe (for 2017–2025 GM trucks) is a straight-through exhaust pipe designed to physically remove and replace the factory Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) system.
Key Benefits of Installing a L5P Duramax Delete Pipe
- Reliability: Eliminate service DEF warnings and electronic limp mode for good.
- Lower Maintenance: End expensive DPF cleanings and the need for constant DEF refills.
- Engine Longevity: Lower backpressure to protect your turbo and internal components.
- Fuel Efficiency: Stop fuel-heavy regen cycles to maximize your miles per gallon.
- Better Cooling: Drop operating temperatures by removing restrictive exhaust bottlenecks.
- Performance: Experience instant throttle response and much faster turbo spooling.
L5P Duramax Delete Pipe: Deleted vs. Stock
| Dimension |
Stock |
Deleted |
| Horsepower |
Factory rated (445–470 HP); power is often capped to protect emissions hardware. |
Increased; Safe gains of 50–150+ HP are standard; race tunes can push 650+ HP. |
| Fuel Economy |
Lower; Significant fuel is wasted during "Regen" cycles to burn off accumulated soot. |
Improved; Eliminating regens and backpressure typically gains 3–5 MPG on the highway. |
| Maintenance Cost |
High; Requires frequent DEF refills and expensive NOx/EGT sensor repairs. |
Minimal; Permanently removes the need for DEF and high-cost emissions component service. |
| Reliability |
Moderate; Emissions sensors and DPF clogs are the #1 cause of "Limp Mode" and downtime. |
Significantly Enhanced; Removes the most frequent mechanical and electronic failure points. |
| Exhaust Gas Temp |
High; Filter restrictions trap heat; EGTs spike dangerously during active regeneration. |
Lower EGTs; High-flow design drops sustained operating temperatures by 150–230°F. |
| Legal Status |
100% Street Legal; EPA and CARB compliant. |
Off-Road / Competition Use Only. |
| Exhaust Flow |
Restricted; The dense DPF and SCR assembly create a massive bottleneck for gases. |
Maximum; A straight-through 4" or 5" pipe allows the engine to "breathe" without restriction. |
| Backpressure |
High; Increases drive pressure on the turbo, leading to heat and internal stress. |
Minimal; Virtually eliminates backpressure, resulting in a faster-spooling turbocharger. |
| Sound |
Silent; Multiple stages of emissions hardware act as a heavy muffler. |
Aggressive; Unlocks the signature "V8 Diesel Rumble" and distinct L5P turbo whistle. |
| Supports Tuning |
Limited to emissions-compliant software only. |
Required; Must be paired with a delete-capable tuner and an unlocked/swapped ECM. |
L5P Duramax Delete Pipe Models Year Fitment Guide
Choose the perfect L5P Duramax Delete Pipe by year to guarantee seamless fitment and performance. We offer delete pipes tailored to the exhaust configurations of the 3.0L EcoDiesel platform.
| Duramax Delete Pipe |
Model Year |
Emissions Systems Equipped |
Common Issues |
Recommended Delete Pipe Setup |
| L5P Duramax Delete Pipe |
2017–2019 |
EGR, DPF, DEF (SCR) |
Frequent regen cycles, DEF faults, sensor failures |
DPF + SCR Delete Pipe with supported tuning |
| 2020–2022 |
Advanced EGR, DPF, DEF (Updated ECM Security) |
Limited tuning availability, strict ECM controls |
Year-Specific Delete Pipe (supported applications only) |
| 2023–2024 |
Next-Gen Emissions & Enhanced ECM Encryption |
Very limited compatibility |
Vetted Delete Pipes for Supported Models Only |
Below is a guide to our specialized L5P Duramax Delete Pipe solutions. You can select the corresponding product below to view full specifications and compatibility details:
| Feature |
4" Duramax L5P DPF & CAT Delete Pipe
|
5" Duramax L5P Downpipe-Back Full Exhaust System
|
| Pipe Diameter |
4 Inch |
5 Inch |
| System Type |
Sectional Pipe |
Downpipe-Back (Full) |
| Coverage |
Replaces only the DPF/CAT section |
Replaces everything from the downpipe to the tailpipe |
| Components Deleted |
DPF & CAT |
DPF & CAT (Full System) |
| Material |
T409 Stainless Steel |
T409 Stainless Steel |
| Sound Level |
Aggressive |
Deepest & Loudest |
| Complexity |
Simple (Bolt-on mid-section) |
Moderate (Full system install) |
Note: A compatible tuner is strictly required after installing any of these products. The tuner is used to deactivate the electronic sensor signals generated by the removal of the DPF/CAT, preventing the vehicle from entering limp mode or triggering fault codes.
How to Install a L5P duramax delete pipe
Installing an L5P Duramax delete pipe (2017–present) replaces the factory emissions exhaust components with a high-flow pipe designed to reduce exhaust restriction, lower exhaust gas temperatures (EGTs), and improve overall drivability.
Installation Steps
- ECM Unlock & Calibration: The process begins with ECM unlocking and tuning using a supported platform. This prepares the engine management system for the removal of emissions components and disables related diagnostics.
- Factory Emissions Exhaust Removal: The factory exhaust section containing the DPF and SCR (DEF) components is removed. Associated sensors such as EGT and NOx sensors are disconnected or electronically disabled according to the tuning configuration.
- Delete Pipe Installation: The L5P delete pipe is installed in place of the factory emissions exhaust. These pipes are designed to align with factory hangers and provide proper clearance around the frame, drivetrain, and suspension components.
- Sensor & Connection Verification: Any required sensor fittings or plugs are installed, and all clamps and connections are aligned and secured to ensure a leak-free exhaust system.
- System Check & Final Verification: After installation, the engine is started and inspected for exhaust leaks. The tuner is used to clear any remaining diagnostic codes and confirm proper operation during a short test drive.
Note: Every EngineGo kit includes a comprehensive, model-specific guide to ensure your installation is seamless and your fitment is guaranteed. For technical deep-dives, step-by-step photos, and specific torque specs, you can find detailed information under the Installation Guide tab on every product page.
Why Choose EngineGo for Duramax LML Delete Kits
Choosing EngineGo means partnering with diesel performance experts. We back every build with technical support, ensuring your truck moves from the shop to the street with peak power and reliability.
15+ Years of Expert Support
In-House Specialists: Our team has over 15 years of hands-on experience in Ford Powerstroke, Cummins, and Duramax platforms..
Expert Guidance: We provide comprehensive support, from initial fitment questions to final tuning advice.
High-Performance Reliability
Built to Last: We pride ourselves on offering parts designed for maximum durability and long-term reliability.
Expertly Vetted: Every product is backed by our deep understanding of diesel engines.
A Seamless Shopping Experience
Free Shipping: Many of our kits include free shipping to get your project started without extra costs.
Money-Back Guarantee: Shop with confidence knowing your purchase is protected if you aren't satisfied.
Off-Road Use Disclaimer
Diesel delete kits are intended for off-road and competition-use vehicles only. These products are not legal for use on public roads and are sold strictly for non-emissions-controlled applications.
Always verify and comply with local, state, and federal regulations before purchase or installation.
FAQ
Why is the L5P so much harder to delete than older Duramax models?
Starting in 2017, GM encrypted the E41 (and later E42) ECM. Unlike older models where you could simply plug in a handheld tuner, the L5P requires a physical unlock. You must either send your factory ECM to a specialist or buy a pre-unlocked unit. Without this "cracked" computer, the truck cannot accept the software required to run without a DPF.
Do I really need CAN Bus Plugs?
Yes, they are mandatory. On the L5P, the sensors under the truck are part of a communication loop.() If you simply unplug them and leave the harness open, the electrical "circuit" is broken, and the truck's computer will lose communication with other modules, preventing it from starting. These plugs cap off the harness to keep the computer's network closed and protected from the elements.
