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  • For Off-Road Use Only
    Black Bandit Race Exhaust 4-inch / No Muffler GM Duramax L5P - Down-pipe Back Race Exhaust System (2017-2023)
  • For Off-Road Use Only
    Black Bandit Race Exhaust GM Duramax L5P - Down-pipe Back Race Exhaust System (2017-2023)
  • For Off-Road Use Only
    Black Bandit Race Exhaust 5-inch / No Muffler GM Duramax L5P - Down-pipe Back Race Exhaust System (2017-2023)
  • For Off-Road Use Only
    Black Bandit Race Exhaust 4-inch / With Muffler GM Duramax L5P - Down-pipe Back Race Exhaust System (2017-2023)
  • For Off-Road Use Only
    Black Bandit Race Exhaust 5-inch / With Muffler GM Duramax L5P - Down-pipe Back Race Exhaust System (2017-2023)
  • For Off-Road Use Only
    Tuner Depot 4-inch Downpipe-Back GM Duramax L5P 6.6L Downpipe Back Exhaust System 2020-2023
  • For Off-Road Use Only
    Tuner Depot 5-inch Downpipe-Back GM Duramax L5P 6.6L Downpipe Back Exhaust System 2020-2023
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GM Duramax L5P 6.6L Downpipe-Back Exhaust System (2017-2025)

Sku: ESSS-GM-17-4

This product fits:

2017–2019 Chevrolet Silverado / GMC Sierra 2500HD–3500HD 6.6L Duramax L5P
$825.00
$654.50
-21%
Shipping calculated at checkout.
Choose Your Year: 2017 - 2019
Select Exhaust System:: 4-inch Downpipe-Back
Muffler Option: No Muffler

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Notification for the incorrect product/variant will be listed here.

Click here to find the right tuner for your truck!
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Within the device vehicle info section, look for the value with the text containing "14C204":
HC3A-14C204-ABH

Once you receive the device, please contact us with your serial number, VIN, and ECU strategy so we can create the custom tunes and send it to you for tuning your vehicle.

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Please note: All sales of exhaust pipes, straight pipes, and engine pipes are final and Non-Returnable and Non-Refundable

Black Bandit Series 3 material image
T304 Stainless Steel

The Purest Stainless Steel used in Exhaust System Manufacturing

rust resistant icon

High Rust Resistance

Lasts up to 20+ years icon

Lasts Up To 20+ years

Looks better icon

Looks Better

Black Bandit title material-image
T409 Stainless Steel

The Standard Stainless Steel used in Exhaust System Manufacturing

rust prone icon

Low Rust Resistance

Lasts up to 20+ years icon

Lasts Up To 5-8 Years

Looks better icon

Looks Dull

Attention

A 2022 Cummins Tune Package was added to your cart. This tune is a beta tune that may cause the following:

  • Low power
  • Poor fuel mileage
  • Engine codes that may appear
  • Poor shifting characteristics

For a tested and proven tune, please view our Ram Cummins 6.7L All-in-One DPF/DEF/EGR Delete Kit w/ECM Swap (2022-2024)

Attention

You have added a product to your cart that requires the Service. This required additional service is NOT included in the price shown on TunerDepot.com. This means that you will be required to pay for the Service in addition to the product you have just added to the cart.

Introduction

Unlock the full potential of your Chevrolet Silverado or GMC Sierra 2500/3500HD 6.6L Duramax L5P with the Downpipe-Back Race Exhaust System, available for 2017–2019 and 2020–2025 models. Built from 16-gauge stainless steel and offered in 4-inch or 5-inch variants. This L5P downpipe back exhaust delivers unrestricted flow, improved throttle response and a deep aggressive tone purpose built for serious off-road and competition use.

Available Variants

  • 2017–2019 GM 2500/3500HD Duramax L5P
  • 2020–2025 GM 2500/3500HD Duramax L5P

Both versions feature a 4” or 5” stainless steel configuration designed to fit each model generation precisely.

Features

  • 16-gauge stainless steel construction for strength and corrosion resistance
  • 4” and 5” diameter options to tailor flow, tone and application
  • Downpipe-back race exhaust design for maximum airflow and power
  • OEM-style hangers and prewelded contour bends for accurate fitment
  • Improved flanges and stainless clamps for secure, leak-free connections
  • OEM-style 4-bolt turbo flange (2020–2025 variant only)
  • No bungs for a clean, unrestricted exhaust path
  • Fits EC-CC/SB-LB-Dually configurations (not for Cab & Chassis trucks)
  • Ease of installation with all necessary hardware included

Benefits

  • Boosts horsepower and torque by reducing exhaust restriction
  • Lowers EGTs during towing and heavy load operation
  • Improves turbo spool and throttle response
  • Enhances airflow for better engine breathing and efficiency
  • Produces a deep, performance-driven exhaust tone
  • Built from premium stainless steel for long-term durability in harsh conditions

Compatibility

  • 2017–2019 Chevrolet Silverado / GMC Sierra 2500HD–3500HD 6.6L Duramax L5P
  • 2020–2025 Chevrolet Silverado / GMC Sierra 2500HD–3500HD 6.6L Duramax L5P
  • Fits EC-CC/SB-LB-Dually trucks
  • Not compatible with Cab & Chassis models
  • 2020–2025 models must have OEM-style 4-bolt turbo flange

Technical Specifications

  • Material: 16-gauge stainless steel
  • Diameter: 4” or 5” mandrel-bent tubing
  • Configuration: Downpipe-back, single side exit
  • Finish: Natural brushed stainless
  • Hardware: Stainless clamps, contour-bent hangers, prewelded flanges
  • Design: Bung-free, high-flow race system

Installation & Notes

  • Direct bolt-on installation using factory hanger points
  • No cutting or welding required
  • Must be paired with off-road race tuning for proper performance
  • Professional installation recommended for best results
  • For off-road and race applications only

Frequently Asked Questions

Q1: What sizes are available?
A1: Choose between 4-inch or 5-inch stainless steel versions.

Q2: Does it require tuning?
A2: Yes. Race tuning is required for correct performance and to prevent error codes.

Q3: Are all components included?
A3: Yes. Each kit includes clamps, contour-bent hangers and improved flanges.

Q4: How does it change sound and performance?
A4: Expect a deeper exhaust tone, faster turbo spool, lower EGTs and improved throttle response.

Important Product Information

Off-Road Use Only: The products sold on this website are intended for off-road use only, and may not be legal for use on public highways where pollution control laws apply.

Check Local Laws: Before purchasing and installing any of these parts, please check your local and state laws to confirm whether the modifications are legal in your area.

Professional Installation Recommended: These kits and parts are strongly recommended to be installed by professional mechanics only. Improper installation may lead to performance issues or damage to your vehicle. Unless specified differently on the product page, our parts do not include installation instructions. They are intended for individuals with a proficient understanding of mechanical systems and procedures. Like many aftermarket parts compatible with a variety of vehicles, minor adjustments or modifications may be necessary during the installation process. We cannot accept returns or offer refunds on the basis of an inability to complete the installation due to the absence of instructions.

Warranty: The use of these parts will void the warranty of your vehicle. Please confirm with your vehicle manufacturer before purchase and installation.

No Liability: Tuner Depot is not responsible for any damage or issues that may arise from the use of these parts.

Product Images: Product images are for illustrative purposes only and may differ from the actual product due to manufacturer design changes or improvements.

No Performance Guarantees: While these parts are designed to enhance the performance of your vehicle, no guarantees are made regarding the specific performance gains that will be achieved.

Shipping Policy at Tuner Depot

At Tuner Depot, we understand the importance of timely delivery for your performance parts. We're committed to ensuring a seamless shipping experience, striving to dispatch your orders with utmost efficiency and speed.

Our Shipping Policy: Our aim is to dispatch all orders within two business days, providing you with a quick and efficient processing time. However, unforeseen circumstances beyond our control may occasionally impact shipping times.
Factors Affecting Shipping:
  • Weather Conditions: Adverse weather conditions such as rain, snow, or sleet may affect delivery timelines. We will make every effort to minimize any delays.
  • Holiday Periods: Please note that our shipping center will be closed during holidays. We will resume shipping promptly on the next business day. Allow for potential delays during peak seasons, but rest assured, we will keep you informed every step of the way.
  • Staff Availability: Unforeseen circumstances can occasionally affect our staffing levels, possibly leading to minor delays. We are committed to swiftly resolving any issues to maintain our high standards of service.
We genuinely appreciate your understanding and patience during any unexpected obstacles. Be assured that we will utilize every resource available to deliver your performance parts promptly.