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Boost your 2017-2025 6.6L L5P Duramax performance and longevity with our high-quality EGR/DPF 2-in-1 Delete Kit. Designed to eliminate restrictive emissions systems, this kit improves horsepower, torque, and fuel efficiency while reducing engine heat and maintenance costs. Perfect for diesel enthusiasts seeking optimal engine performance and reliability.

Key Features

Dual Functionality – Combines EGR delete and DPF delete in one kit for a complete emissions system solution.
Enhanced Performance – Reduces exhaust backpressure, unlocking better throttle response, increased horsepower, and improved fuel economy.
Cooler Engine Temps – Eliminates EGR-induced heat, reducing stress on the engine and extending its lifespan.
Reduced Maintenance – Prevents costly DPF clogging and EGR-related carbon buildup, saving on repairs.
High-Quality Construction – Made from durable, precision-engineered components for a perfect fit and long-term reliability.
Easy Installation – Includes all necessary hardware and clear instructions for a smooth DIY or professional install.
Compatible with Tuners – Works seamlessly with aftermarket tuning solutions to maximize performance gains.

Specification

Exhaust Material	T-409 Stainless Steel, it is magnetic.
Thickness	2mm thick for long-lasting durability and heat resistance.
Inlet Diameter	4.0"/5.0‘’
mandrel-bent construction	Maximum flow efficiency, helping your diesel breathe easier

Installation

2017-2025 6.6L Duramx DPF Delete Pipe Instruction

2017-2025 6.6L Duramax EGR delete kit instruction

Tuner Required for Installation: Installing a 6.6 Duramax delete pipe requires more than just swapping out hardware. When removing of the DPF, CAT, SCR, and/or DOC involves removing and eliminating emission related sensors. A DPF delete capable tuner is required to prevent any check engine light or diagnostic trouble codes from setting.

How to Choose DPF Delete Kit?

4” vs 5” Straight Pipe Comparison

When choosing a 6.6 Duramax delete pipe, the most common options are 4-inch and 5-inch straight pipes.
The 4-inch straight pipe delivers a tighter, raspier exhaust note—especially noticeable at lower RPMs—making it ideal for daily driving or mildly tuned setups where excessive drone is undesirable.
In contrast, the 5 inch straight pipe 6.7 Duramax offers a deeper, more refined tone with less high-pitch resonance. It excels in high-output builds and towing scenarios, where increased exhaust flow is beneficial.

Driver feedback suggests:

4”straight pipe is great for stock-to-lightly-modded trucks and a quieter cabin
5”straight pipe is perfect for aggressive builds, deeper tone lovers, or anyone maximizing exhaust performance

Different Types of DPF Delete

DPF Race Delete

Only removes the DPF (keeps stock downpipe)
Minimal performance gain but cheapest option
Best for budget-focused or emissions-testing avoidance

Downpipe-Back Delete

Replaces exhaust from the turbo downpipe backward
Improves mid-range power and throttle response
Good for street builds keeping stock turbo

Turbo Back Delete

Full system replacement from turbo outlet
Includes high-flow downpipe for maximum efficiency
Reduces turbo lag and boosts top-end power
Top choice for tuned/high-performance engines

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2017-2025 L5P 6.6L Duramax Diesel GMC Sierra 2500 HD
2017-2025 L5P 6.6L Duramax Diesel GMC Sierra 3500 HD
2017-2025 L5P 6.6L Duramax Diesel Chevrolet Silverado 2500 HD
2017-2025 L5P 6.6L Duramax Diesel Chevrolet Silverado 3500 HD
Does NOT fit Cab & Chassis truck.

You can also explore our L5P delete kit bundles for more performance combinations.

Spelab 6.6L Duramax L5P DP-Back must be used together with our downpipe. The factory downpipe has an integrated SCR assembly and cannot connect directly. Ours must be installed first to allow proper attachment of the subsequent exhaust section.

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Q1. Will I need a tuner after installation?
A1. Yes! Deleting the EGR and DPF requires a custom tune to prevent check engine lights and ensure proper engine operation. The factory ECU expects these systems to function, so a tuner (like SCT, H&S, or EZ Lynk) is necessary to optimize performance.

Q2. Does this kit improve fuel mileage?
A2. Many users report 1-3 MPG gains after deleting the DPF, as the engine no longer wastes fuel on forced regenerations. Combined with a proper tune, you can maximize efficiency.

Q3. How difficult is the installation?
A3. Installation is moderate to advanced and requires mechanical experience. The DPF delete involves exhaust modifications, while the EGR delete requires removing the cooler and related components. Some welding may be needed depending on the kit configuration.

Q4. Will deleting the EGR/DPF hurt my engine?
A4. No—in fact, it reduces engine stress by eliminating soot buildup in the intake (from EGR) and excessive backpressure (from the DPF). However, proper tuning is critical to avoid issues.

Q5. Does this kit include everything I need?
A5. Most kits include EGR block-off plates, DPF delete pipes, clamps, and hardware, but some may require additional components (like a tuner or up-pipes). Always check the product description before purchasing.

Q6. Can I pass emissions testing after installing this kit?
A6. No. Since the EGR and DPF are removed, your truck will not pass emissions inspections in states that require them. You may need to reinstall stock components for testing.

Q7. Will my truck throw check engine lights (CELs) after install?
A7. Without a proper tune, yes—the ECU will detect missing emissions components. A quality tuner will disable these codes and optimize performance.

Q8. How much horsepower can I gain?
A8. Results vary, but many users see 50-100+ HP gains (with tuning) due to reduced exhaust restrictions and improved airflow.

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Fast Shipping Policy

Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy

Easy Return Policy

Every order comes with a 14-day free return, which means you don't have to pay for a return slip. Click for Return Policy

2020-2024 L5P 6.6L DURAMAX APPLICABLE PRODUCTS

EGR/DPF Delete Kit for 2017-2025 6.6L Duramax L5P 2500HD 3500HD