What's a Duramax Delete Pipe?
A Duramax Delete Pipe is an straight-through exhaust pipe designed for Duramax diesel engines that removes and replaces factory emissions-related exhaust parts. Its primary purpose is to remove exhaust restrictions so the engine can flow exhaust gases more freely, which improves performance in vehicles.
Find the Right Duramax Delete Pipe for Your Truck
We offer engine-specific Duramax Delete Pipes to ensure proper fitment and optimal performance across all Duramax generations:
- LB7 Duramax Delete Pipe (2001–2004)
- LLY Duramax Delete Pipe (2004.5–2005)
- LBZ Duramax Delete Pipe (2006–2007)
- LMM Duramax Delete Pipe (2007.5–2010)
- LML Duramax Delete Pipe (2011–2016)
- L5P Duramax Delete Pipe (2017+)
Key Benefits of Installing a Duramax Delete Pipe
- Reliability: Eliminate DPF clogs to prevent limp mode and sensor failures.
- Fuel Efficiency: End fuel-wasting regen cycles for better mileage on every tank.
- Lower Maintenance: Stop expensive DPF cleanings and the need for constant DEF refills.
- Engine Longevity: Reduce backpressure to protect your turbo and internal components.
- Better Cooling: Lower engine temps by removing restrictive factory bottlenecks.
- Performance: Enjoy faster turbo spooling and sharper throttle response.
Duramax Delete Pipe: Deleted vs. Stock
| Dimension |
Stock (Factory) |
Deleted (Upgraded) |
| Horsepower |
Factory limited (360–470 HP); modern DPFs (like L5P) are efficient but still restrict peak race power. |
Increased; Safe gains of 50–150+ HP are common. With race tuning, L5P models can exceed 700 HP. |
| Fuel Economy |
Lower; Efficiency is lost during fuel-heavy regen cycles. Average highway: 13–15 MPG. |
Improved; Most owners report a 2–5 MPG increase (18–20 MPG highway) by stopping regens and lowering backpressure. |
| Maintenance Cost |
High; Requires frequent DEF refills, sensor repairs, and periodic DPF cleaning/replacement. |
Minimal; Permanently removes the need for DEF and high-cost emissions component repairs. |
| Reliability |
Moderate; EGR soot buildup, DPF clogs, and DEF pump failures are the most common causes of limp mode. |
Significantly Enhanced; Removes the primary electronic and mechanical failure points of the engine. |
| Exhaust Gas Temp |
High; Restrictive filters trap heat; EGTs spike dangerously (up to 1,200°F+) during active regeneration. |
Lower EGTs; Improved airflow allows the turbo to breathe, dropping operating temperatures by 150–200°F. |
| Legal Status |
Street Legal; EPA and CARB compliant. |
Off-Road / Competition Use Only. |
| Exhaust Flow |
Restricted; The DPF acts as a cork, forcing exhaust through a dense ceramic honeycomb. |
Maximum; A straight-through 4" or 5" design provides a zero-restriction path for exhaust gases. |
| Backpressure |
High; Creates significant drive pressure on the turbo, which can lead to premature wear. |
Minimal; Drastically reduces backpressure, resulting in a faster-spooling turbo and lower stress. |
| Sound |
Very Quiet; The factory emissions system acts as a multi-stage muffler. |
Aggressive; Unlocks the signature deep growl and distinct turbo whistle. |
| Supports Tuning |
Only supports factory-compliant or emissions-on performance software. |
Required; Must be paired with a delete-capable tuner (EFI Live / EZ Lynk) to prevent permanent Limp Mode. |
Duramax Delete Pipe Models Year Fitment Guide
Choose the perfect 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 |
Engine & Model Year |
Emissions Systems Equipped |
Common Issues |
Recommended Delete Pipe Setup |
| LB7 Duramax Delete Pipe |
2001–2004 |
EGR (early design) |
Restrictive factory exhaust, intake soot buildup, high EGTs under load |
Straight Delete Pipe (cat / muffler replacement) |
| LLY Duramax Delete Pipe |
2004–2005 |
EGR |
Overheating under load, EGR heat contribution, exhaust restriction |
Straight Delete Pipe (cat / muffler replacement) |
| LBZ Duramax Delete Pipe |
2006–2007 |
EGR |
Exhaust restriction, intake soot buildup |
Straight Delete Pipe (cat / muffler replacement) |
| LML Duramax Delete Pipe |
2007.5–2010 |
EGR, DPF (No DEF) |
Frequent regen cycles, DPF clogging, high EGTs |
DPF Delete Pipe (4” or 5”) with supported tuning |
| 2011–2016 |
EGR, DPF, DEF (SCR) |
DEF faults, sensor failures, regen downtime |
DPF + SCR Delete Pipe with compatible tuning |
| L5P Duramax Delete Pipe |
2017–2019 |
EGR, DPF, DEF (Updated ECM) |
Stricter ECM control, limited tuning options |
Year-Specific Delete Pipe (supported applications only) |
| 2020+ |
Advanced EGR, DPF, DEF, Enhanced ECM Security |
Very limited compatibility |
Vetted Delete Pipes for Supported Models Only |
Below is a guide to our specialized EcoDiesel delete solutions. You can select the corresponding product below to view full specifications and compatibility details:
Note: A compatible tuner is strictly required after installing any of these products. The tuner is essential to recalibrate the ECM, prevent limp mode, and clear all diagnostic trouble codes (DTCs) related to the removed emission systems.
How to Install a Duramax Delete Pipe
Installing a Duramax Delete Pipe replaces restrictive factory exhaust components with a straight-through section designed to improve exhaust flow, lower exhaust gas temperatures (EGTs), and enhance overall drivability. The exact process varies by Duramax generation (LB7, LLY, LBZ, LMM, LML, or L5P), but the core approach remains the same: identify your engine platform, confirm tuning compatibility, and follow a clean install sequence.
Installation Steps
- Vehicle Preparation: The truck is safely positioned, and the factory exhaust layout is inspected to identify the section being replaced—such as the muffler, catalytic converter, or DPF/SCR assembly depending on the model year.
- Tuning Preparation: On DPF-equipped Duramax engines, the ECM is calibrated using a supported tuner before hardware removal. This step disables emissions-related diagnostics and prevents warning lights or limp mode once factory components are removed.
- Factory Exhaust Section Removal: The selected factory exhaust section is unbolted and removed. Any sensors associated with the removed section are disconnected or electronically disabled according to the tuning configuration.
- Delete Pipe Installation: The delete pipe is installed in place of the factory exhaust component. These pipes are designed to align with factory hangers and provide proper clearance around the frame, drivetrain, and suspension.
- Alignment & System Check: Connections are aligned and secured to ensure a leak-free seal. The engine is started and inspected for exhaust leaks, and normal operation is verified during a brief 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 Delete Pipe
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
Which generations of Duramax have a DPF?
Only the 2007.5 and newer models (LMM, LML, and L5P) are equipped with a Diesel Particulate Filter (DPF).
- LB7, LLY, and LBZ (2001–2007): These do not have a DPF. A delete pipe for these years usually refers to a high-flow downpipe or a front pipe that removes the restrictive factory catalytic converter.
- LMM, LML, L5P (2007.5–Present): These require a full DPF delete pipe to remove the filter and stop regeneration cycles.
Do I need a tuner after installing the pipe?
Yes. For all models 2007.5 and newer, a tuner (like EFI Live, EZ Lynk, or HP Tuners) is mandatory. Without it, the ECM will detect that the DPF is missing or clogged and immediately force the truck into a permanent Limp Mode (limited to 5 mph or reduced power).
Will my fuel economy (MPG) actually improve?
Yes. Most Duramax owners report a gain of 2–5 MPG. The biggest factor is the elimination of the regen cycle, which uses extra fuel to heat the exhaust and burn off soot. By removing the restriction and optimizing fuel timing, the engine operates significantly more efficiently.
What is an EGR Delete vs. a DPF Delete?
- DPF Delete: Removes the filter in the exhaust pipe. This is primarily for airflow and stopping regens.
- EGR Delete: Removes the system that recirculates hot exhaust gases back into the intake. This prevents the soot sludge buildup that clogs intake manifolds and protects the engine from EGR cooler leaks, which can lead to blown head gaskets.
Does a delete kit remove the need for DEF fluid?
On 2011 and newer (LML and L5P) models, a delete kit effectively disables the SCR system. Once the truck is tuned, you will no longer need to refill the Diesel Exhaust Fluid (DEF) tank. You can leave the tank in place or remove it to save weight and gain ground clearance.
