Fitment wasn’t the greatest could improve a lot
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2026
Stainless Steel Diesel Muffler
4-Inch
409 Stainless Steel
Regular price
$104.50
Regular price
Sale price
$104.50
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MULTI-FITMENT
Stainless Steel Diesel Muffler
Stainless Steel Diesel Muffler
SKU: SKU:MUF-SS-4
Regular price
$104.50
Regular price
Sale price
$104.50
Quantity
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Diesel Performance Exhaust Muffler: Upgrade Your Truck's Sound and Performance
Enhance your truck's sound and improve performance with our Diesel Performance Exhaust Muffler. Available in two models—T409 Unpolished 4-inch Muffler and T409 Unpolished 5-inch Muffler—you can choose the perfect fit for your vehicle. Whether you want a throaty exhaust note or enhanced performance, we have you covered.
Vehicle Fitment
Our mufflers are universally designed to fit a wide range of diesel vehicles, including Cummins, Duramax, and Powerstroke trucks. Additionally, when paired with Black Bandit Exhaust Systems, which come with pre-bent and pre-welded hangers, installation is seamless. These mufflers are the ideal upgrade for both classic diesel trucks and the latest models.
Product Options
| Feature | 4-Inch | 5-Inch |
|---|---|---|
| Inlet Size | 4-inch inner diameter | 5-inch inner diameter |
| Outlet Size | 4-inch inner diameter | 5-inch inner diameter |
| Overall Length | 20.25 Inches | 20.25 inches |
| Body Length | 14 inches | 14 inches |
| Body Size | 7-inch round | 8-inch round |
Product Features
Our mufflers offer several features, all designed to deliver superior airflow and improved sound quality:
- Straight-through flow path: This maximizes performance by reducing back pressure.
- Non-directional design: You can install it in either direction, providing flexibility.
- Stainless steel construction: Built for durability, these mufflers withstand harsh conditions.
- Internal mesh and fiberglass: This advanced design absorbs unwanted interior resonance, ensuring a richer, deeper exhaust note.
Why Choose Performance Exhaust Mufflers?
4 inch diesel muffler and 5 inch muffler for diesel are not just components; they are upgrades. With a straight-through design to reduce back pressure, you will experience enhanced performance and a rich, throaty exhaust sound.
And if you want to add the perfect finishing touch to your upgraded exhaust system, consider pairing it with our T304 Exhaust Tip for a complete transformation.
Important Notes
Be sure to select the correct size for your vehicle whether you are selecting 4 diesel muffler or a 5 inch muffler for diesel and check compatibility with your exhaust system to ensure the best fit and performance. Mufflers do not come with any hardware, you may need to weld it in or provide your own clamps if the exhaust system you are using doesn't have the appropriate 'muffler-delete pipe' to directly replace with the muffler.
Universal
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.
Warranty
Hardware components are covered by Tuner Depot's standard warranty. Tuning devices and software carry manufacturer warranty terms. Use of these products will void your vehicle's factory warranty. Please confirm with your manufacturer before installation.
Off-Road Use Only
These products are intended for off-road, race, and competition use only and may not be legal for use on public highways where emissions laws apply. Check your local and state regulations before purchase.
Customer Reviews
Overall rating: 4.6 / 5 from 162 reviews.
Tuner depot was very helpful I thought I screwed up on the tune part and flashing the ecm but there customer service told me I didn’t mess it up and helped me through it but one thing for sure is nothing to do with tuner depot but no one every tells you on a first time doing one of these trucks the amount of hours it takes it took me almost 30 hours which if I had the right tools and confidence I could of probably cut it down to about 20 but kit works great it’s got awesome power now and I’ll be doing the down pipe very soon to I highly recommend just buying it and getting it over with because the truck is still very quiet almost like it’s a notch above stock
GM Duramax L5P All-In-One DPF/DEF/EGR Delete Kit (2017-2025)
Just got them installed on my truck yesterday and cannot believe the increase in performance! Can’t wait to take it on a road trip already see more power increase and fuel mileage. Unbelievable would do it again tomorrow!
Love the sound of the straight exhaust especially on the Dirtymax they just sound badass without a muffler
I purchased the efi live sotf tunes along with Dpf delete kit, dpf was good quality, tuner worked with me and not only sent my autocal loaded with a sotf tune but also sent me a few single tunes to use until I installed the switch, the only negative was that 130hp was the max power tune single or switch on the fly, but over all I was pretty happy and service was very good throughout.
Should come with clamps
Everything went smooth and lined up great just wish it would’ve came with instructions
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2026
Customer service absolutely sucks!!!!
Great product
L5P Downpipe 3.5 Inch Turbo Direct Pipe | 2017-2026 GMC Chevrolet
Worked and fit as expected
Perfect sound
Could have come with some kind of directions. Made it through it ok but a little direction would have been nice. Overall everything works as it should.
Sounds great not to loud
Before installing never had a code after install getting low fuel rail pressure code under load. If I keep RPMs up just a little ( by switching to manual shift and never come out of 5 gear Allison 6 speed trans) will work fine . If u shift to 6th gear lower RPM as soon as u go up a little incline it starves for fuel and goes into reduced power mode. But if u mash the excelsior and down shifts it will take off like a rocket.
Worked perfectly.
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2025
Sounds good.
I received a product that was very different from what I ordered, and I have tried to contact you but haven't received a response.
6.6L Duramax L5P Cold Air Intake | 2017-2026 Sierra/ Silverado
Truck has a nice rumble but not excessively load like a straight pipe.
Muffler has great sound, no restrictions. The best part of the whole deal was the outstanding service and shipping that Tuner Depot provided. Would definitely use them again.
Fit was very good and looks great on my vehicle.
6.6L Duramax L5P 5 Inch Downpipe-Back Exhaust System | 2017–2025
Sound is exactly what I was looking for.
Was a little nervous if it was going to show up, nice quality and ease of install would purchase again
GM Duramax 6.6L - Shibby Engineering Tuner Harness Plug Kit (2011-2023)
Excellent
Nice mellow tone and quiet, no diesel is quiet but this muffler makes trips comfortable with no throwing noise at highway speeds.
Glad there are still parts company around
L5P Downpipe 3.5 Inch Turbo Direct Pipe | 2017-2026 GMC Chevrolet
Timely shipping Not yet installed
When buying the delete kit make sure you buy this if your doing a FULL delete. Once installed the truck sounded amazing with the 5 inch exhaust.
L5P Downpipe 3.5 Inch Turbo Direct Pipe | 2017-2026 GMC Chevrolet
Easier install then I expected solid switch cant complain
Really Love The Quality of the Exhaust look Great
L5P 5-Inch Stainless Steel Downpipe-Back Exhaust System | 2017–2025 Duramax 6.6L
Already put On All good Works Great
I Will Be Putting it all together this weekend But Love It
Great
Fit great just a job to install
Shipped very fast and worked great!
Couldn’t be happier with the product super easy to install. Just cut out the old and install the new baby. Love it.
Couldn’t be happier with the price. The product is on point. The shipping was fast and easy and the installation was great. Can’t speak. Highly enough of tuner depot will be ordering again for future purchases guaranteed
Worked very well fast shipping
Everything went smoothly only issue I had was the cheap hose clamps they sent with it would recommend putting better ones in kit
Everything fit well, except for the pipe, reaching back past the last catalytic converter was 9 inches too short I had to find a piece in town to fit that and another band clamp
So far, I am loving all the tunes. There’s a noticeable increase in gas mileage and it really woke up this LBZ. Very happy