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L5P DPF/CAT Delete Race Pipe: Install Guide
June 30, 2025

L5P DPF/CAT Delete Race Pipe: Install Guide

Key Takeaways

  • L5P Duramax delete installation requires compatible tuning and CAN bus plugs
  • DPF and CAT delete race pipe eliminates both the diesel particulate filter and catalytic converter
  • Expected gains: 50-100+ HP, 2-4 MPG improvement, significantly lower EGTs
  • Professional installation recommended—improper fitment can cause exhaust leaks
  • For off-road/competition use only—violates federal emissions regulations for on-road vehicles
If you're looking to unlock the full performance potential of your 2017-2023 6.6L Chevy/GMC Duramax L5P, the Seguler 4" DPF & CAT Delete Race Pipe is the perfect upgrade. This high-performance component is designed for off-road and racing applications, delivering improved exhaust flow, reduced backpressure, and enhanced engine efficiency. Below, we’ll walk you through the installation process and explain why this product is a must-have for your Duramax.

Why Choose the Seguler 4" DPF & CAT Delete Race Pipe?

Before diving into the installation, let’s talk about why this product stands out:

Performance Boost: By removing restrictive factory components, your engine can breathe easier, leading to better throttle response and increased horsepower.
Durable Construction: Made from high-quality materials, this pipe is built to withstand the rigors of off-road and racing environments.
Easy Installation: Designed to fit seamlessly into your existing exhaust system, with clear instructions to guide you every step of the way.
Off-Road Use Only: This product is intended for racing or off-road vehicles and is not compliant with highway regulations. Always check local laws before installation.

Ready to upgrade? Get yours here!

Installation Instructions

Follow these steps to install your new Seguler 4" DPF & CAT Delete Race Pipe:

Step 1: Prepare the Exhaust System

 Remove all sensors from the exhaust pipe.
 Loosen the flange securing the drain pipe and DPF/exhaust pipe assembly.

Step 2: Remove the Factory DPF

Remove all factory plugs and ventilation holes from the diesel particulate filter, tie them to the truck frame or remove them from the clamp connection. Spray the hanger with WD-40, then pry off the hanger from the rubber bracket and remove the DPF from the truck.

Step 3: Disconnect the OEM Downpipe

1.Unscrew the 4-bolt flange that secures the OEM turbine straight pipe and downpipe. Use a 15mm socket to perform this step. (Note: Keep OEM nuts as they will be used with the new system).
2.To facilitate the disassembly of the downpipe, remove the hanger attached to the gearbox and cut off the pipe inlet.

Step 4: Install the New Downpipe #1

Install the downpipe#1 and connect the 4-bolt flange of the downpipe to the 4-bolt flange of the turbine straight pipe with bolts.Press the flange downwards to secure the pipeline, but the pipeline can still move. Fix the hanger back with bolts Transmission.
 

Step 5: Install Pipe#2

Install pipe #2 Connect one end of the sloping surface to the tail end of the # 1 downpipe and tighten it loosely with a fixture. Place the hanger together into the OEM rubber hanger.

Step 6: Install Pipe #3

Measure the distance between the pipe #2 and the exhaust assembly, install the pipe #3, and if necessary, start from the other end of the slope and cut to the required distance.

Step 7: Final Tightening

Starting from pipe #1, tighten the vortex belt clamp and continue tightening until the rear connection, checking the gap while tightening.

At Seguler, we’re committed to providing top-notch products and support. If you run into any issues during installation, don’t hesitate to reach out:
 Email: sales@seguler.com

The Seguler 4" DPF & CAT Delete Race Pipe is the ultimate performance upgrade for your 2017-2023 Duramax L5P. Whether you’re hitting the track or tackling off-road adventures, this pipe delivers unmatched flow and power.

Click here to order yours now!Upgrade Your Duramax Today!

Disclaimer: This product is for off-road and racing use only. Installation on vehicles driven on public highways may violate federal, state, or local laws. Seguler is not responsible for any legal issues arising from improper use. Always comply with local regulations.
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DPF System Duramax L5P Installation Guide Step-by-Step Upgrade

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