Build a custom kitComplete your buildShop parts made for your
Choose your year, make and model and bundle parts that fit. Save up to 5%.Add more parts that fit your truck. Save up to 5% on the bundle.The kit builder only shows parts that fit. Save up to 5% when you bundle.
Stainless Steel Diesel Muffler in 4-Inch and 5-Inch Sizes
This stainless steel diesel muffler is a straight-through performance muffler for diesel trucks. It reduces back pressure and gives your truck a deep, throaty exhaust note. Choose a 4-inch diesel muffler or 5-inch diesel muffler to match your exhaust, then pick 304 or 409 stainless steel. It fits Cummins, Duramax, and Powerstroke trucks and pairs with our complete diesel straight exhaust systems.
Key Specs at a Glance
Sizes: 4-inch or 5-inch inlet and outlet (inner diameter)
Fitment: Cummins, Duramax, and Powerstroke diesel trucks, classic and late model
Hardware: Not included (weld-in or customer-supplied clamps)
How to Choose Your Diesel Muffler Size and Material
This diesel truck muffler comes in four combinations, so you can match your exhaust pipe and choose the steel grade that suits your climate and budget.
Step 1: Choose Your Muffler Size
4-Inch: For trucks with a 4-inch exhaust system
5-Inch: For trucks with a 5-inch exhaust system
Match the muffler to your existing exhaust pipe diameter for the cleanest fit and consistent flow.
Step 2: Choose Your Exhaust Quality
304 Stainless Steel: Premium corrosion resistance that keeps its finish longer
Both grades share the same straight-through design and dimensions.
304 vs 409 Stainless Steel Exhaust Comparison
Feature
304 Stainless Steel
409 Stainless Steel
Corrosion Resistance
Higher (more chromium plus nickel)
Good (lower chromium, no nickel)
Appearance Over Time
Keeps its finish longer
May develop surface discoloration
Price
Premium
More economical
Best For
Road salt, wet climates, visible installs
Value-focused builds and drier climates
What Does a Muffler Do on a Diesel Engine?
A muffler on a diesel engine controls exhaust noise and shapes the sound of your truck. Factory mufflers use chambers and baffles that can add back pressure. A straight-through diesel muffler uses a perforated core instead, so exhaust gas flows freely while internal mesh and fiberglass packing absorb unwanted resonance.
The result is a diesel exhaust muffler that helps your truck breathe easier and sound richer, without the harsh drone of a straight pipe.
4-Inch vs 5-Inch Diesel Muffler Specifications
Specification
4-Inch Diesel Muffler
5-Inch Diesel Muffler
Inlet Size
4-inch inner diameter
5-inch inner diameter
Outlet Size
4-inch inner diameter
5-inch inner diameter
Overall Length
20.5 inches
20.5 inches
Material Options
304 or 409 stainless steel
304 or 409 stainless steel
Flow Design
Straight-through, non-directional
Straight-through, non-directional
Performance Diesel Muffler Features
Every feature is designed to improve airflow and sound quality:
Straight-through flow path: Maximizes performance by reducing back pressure.
Non-directional design: Installs in either direction for added flexibility.
Stainless steel construction: 304 or 409 stainless steel built for durability in harsh conditions.
Internal mesh and fiberglass: Absorbs interior resonance for a richer, deeper exhaust note.
Diesel Truck Fitment: Cummins, Duramax and Powerstroke
This multi-fitment diesel truck muffler fits a wide range of diesel vehicles, including Cummins, Duramax, and Powerstroke trucks. It works on both classic and late-model diesel trucks, as long as the inlet and outlet size matches your exhaust. Use the vehicle selector on this page to confirm fitment.
Installation is seamless with Black Bandit Exhaust Systems, which come with pre-bent and pre-welded hangers.
Important: Select the correct size for your vehicle, whether you need a 4-inch diesel muffler or a 5-inch muffler for diesel, and check compatibility with your exhaust system to ensure the best fit and performance.
Diesel Muffler vs Straight Pipe vs Resonator
A straight-through muffler sits between a full straight pipe and a stock exhaust. It keeps strong flow while controlling drone.
Option
Sound
Flow
Best For
Straight-Through Performance Muffler
Deep, throaty tone with reduced resonance
Low back pressure
Performance with a controlled, aggressive sound
Straight Pipe / Muffler Delete
Loudest, often with cabin drone
Unrestricted
Maximum volume where local laws allow it
Resonator Only
Targets specific drone frequencies
Low restriction
Fine-tuning tone alongside a muffler
Build Your Diesel Exhaust Kit
Get a complete, high-flow diesel exhaust in one order. Start with this muffler and add matching components in our kit builder:
The muffler is non-directional, so it can be installed in either direction. It is designed to directly replace a muffler-delete pipe of the same diameter.
Note: Mufflers do not come with any hardware. You may need to weld it in or provide your own clamps if your exhaust system doesn't have the appropriate muffler-delete pipe to directly replace with the muffler.
Diesel Muffler FAQ
Does a diesel truck need a muffler?
A muffler controls exhaust noise and helps keep a diesel truck within acceptable sound levels. Many states and provinces have vehicle noise and exhaust equipment rules, so check your local regulations. A straight-through performance muffler keeps strong exhaust flow while still controlling harsh noise and drone.
Should I get a 4-inch or 5-inch diesel muffler?
Match the muffler to your exhaust pipe diameter. A 4-inch exhaust system takes the 4-inch diesel muffler, and a 5-inch system takes the 5-inch diesel muffler. Both are 20.5 inches long overall body.
Is 304 or 409 stainless steel better for a diesel muffler?
304 stainless steel is better for road salt, wet weather, or keeping a clean finish longer. 409 stainless steel is a durable, more economical exhaust-grade option. Both versions share the same straight-through design and dimensions.
Will this muffler fit my Cummins, Duramax or Powerstroke?
Yes. The muffler fits Cummins, Duramax, and Powerstroke diesel trucks, both classic and late model, as long as the inlet and outlet size matches your exhaust system. Use the vehicle selector on this page to confirm fitment.
What does a straight-through diesel muffler sound like?
It produces a rich, throaty exhaust note. The internal mesh and fiberglass absorb interior resonance, so the tone is deeper and fuller than a straight pipe.
Does it matter which direction I install the muffler?
No. The muffler has a non-directional design, so it can be installed in either direction.
Does the diesel muffler come with clamps or hardware?
No. The muffler does not include hardware. You may need to weld it in or supply your own clamps if your exhaust system does not have a muffler-delete pipe it can directly replace.
Can I replace a muffler-delete pipe with this muffler?
Yes. If your exhaust system has a muffler-delete pipe of the matching diameter, this muffler is designed to directly replace it.
What else do I need to complete my diesel exhaust?
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.
Items Eligible for Return
These items can be returned within 30 days of the purchase date, provided they are unopened, unused, and in
their original packaging:
Tuning devices – for example, an unopened/unused Mini Maxx V1/V2 or blank EFI Live Device
Cables and device accessories – for example, an unopened/unused switch, bypass cable, universal pyrometer
& docking station
Final Sale / Non-Refundable Items
The following items are final sale and cannot be returned:
Custom tuning – including additional tune files purchased separately or custom tuning purchased with a
device
Exhausts and race pipes – this also includes downpipes purchased separately from an exhaust or race pipe
EGR kits
Manufacturer Warranty
All items we sell include a 90-day manufacturer warranty.
If an item is being returned due to a manufacturer defect, it may be returned for a full refund, exchange, or
replacement with a similar item of equal or lesser value.
For eligible items being returned for any other reason, the same options apply: full refund, exchange, or
replacement with a similar item of equal or lesser value, provided the item meets the return requirements
above.
Return Process
All returns must be approved by our team before being sent back. We will provide a valid RMA number and
prepaid return label for the return.
Please do not send any items back without an approved RMA and the return label provided by us, as returns
sent without these will not be accepted or processed.
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: 4.5 / 5 from 205 reviews.
Tuner Depot and Black Bandit have been amazing. From having purchasing mistakes on my end to having small issues and big. Needing to have a lot of back and forth to get my tune adjusted for many reasons mostly personal. They have never been hard to work with and communication is ALWAYS quick even when there’s no number for the tuner email has been just as easy. Thank you. My truck is amazing! The products are well made and have no issues with them. Especially Bailey. Thank you!!!! 2011 Duramax,EGR,PCV, grid heater throttle valve delete and 4 inch straight exhaust.
Exhaust was too short, customer service eventually just quit responding after sending picture after picture of it being too short. The exhaust rubs on the transmission hanger bracket so I had to remove and cut that down. I would not buy this kit unless you want to spend extra time modifying it.
Runs great emailed tuner depot. They told me exactly what tunes I ordered and what each switch does on the four position switch. They were very quick to respond. Everything works great.
Had to get my tunes adjusted a little bit from they originally sent. But with the new tunes truck runs great and lots of power. I just run lvl 3 tow tune and im very pleased with it. Haven't gone past level 3 to test the power, trying not to break stuff but Imagine they are nice.
I had a friend install it he also recommended the tune and everything where to buy it 2hr job he was done truck had blown def pump wasn’t going to fix it so I had it all taken out runs like a dream now bye bye dpf
Over all I am extremely happy with this kit. Things that need addressing:
You have to ask for the installation instructions for the EGR delete kit to be emailed to you. The EGR kit does not come with the barbed/NPT threaded nipple adapter like other kits do. It also doesn’t have a good locking mechanism to hold the orher end of the heater hose into the junction. (See photos). There for I had to use galvanized wire to secure it because it eventually started to separate even though the plate was holding it together.
The stainless exhaust is awesome. I did the upgraded to 308 stainless and it is high quality! I didn’t have to trim or cut the pieces at all on my short bed mega cab.
Once I figured out how to install the programming into the the tuner that was also pretty easy. Customer service is very good and quick to reply to emails and they are Americans, if you call in.
Downloading was a breeze.
Truck performance is awesome.
MPG went up about 8 miles to gallon.
The transmission shift points could be a little better. Overall the tunes provided by them are great.
Received my 2019 Ram 2500 complete delete kit in 5 days from ordering, all parts arrived undamaged. The install was not too complicated assuming you have some mechanical abilities and are comfortable tearing your truck apart. Highly recommend shorty 15mm for one of the bolts on the EGR elbow on the front of the engine, that was the biggest pain out of everything. My truck sounds amazing now!! I could not believe how much better the truck drives and sounds. Customer service was super responsive as well, I reached out several times with a few questions along the way from ordering to install and they responded quickly and with the information I needed. I would definitely order from them again.
Solid tunes truck feels good not much smoke at all. Trans seemed to slip in second right after the 1-2 shift but has gotten much better for sure I think it just needed sometime to recalibrate and understand what was going on
Ryan has been great to deal with very communicative amazing response time and great service, all around price was amazing will only use Tunes Depot for all my tuning and hopefully more THANKS Ryan
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
Everthing worked great, installion was easy if you follow the process to the letter, performance is amazing,fuel mileage has gone up 1.5 mpg. Am well pleased
22 2500 SO
Absolutely loving this kit! Truck sounds like a real diesel now.. Everything came within 3-4 days, installation was super easy if you follow all directions provided. Had a few questions regarding installed mods on the truck, support and the tuner were very helpful!
I ordered my kit about a year ago and finally got the courage to install it. I had one moment of panic while programming the ECU. The flash didn't take and after reaching out to the support team, I overlooked the bypass wire instructions for my year truck. After swapping the wires, everything went smoothly. I ordered just the delete pipe and it fit perfectly without any cutting. I'm very pleased with the product and support that Tuner Depot has provided.
So glad I went with TunerDepot! These guys have the best customer service and answered all my questions leading up to my purchase. Shipping was quick as I received my kit in 2-3 days. Everything to install was straight forward. I received an email with attached pdfs that included instructions on each item except for the EGR. I found a video by Dark Iron Diesel on Youtube, very helpful for the EGR if you have not done it before. Lastly, I installed a 13-18 5" SS exhaust I had laying around on my 19. Did not fit at all, but not difficult to shorten downpipe/reweld flange in order to fit stock downpipe on my 19. Also threw on a SS muffler from TunerDepot. Sounds great, but still pretty damn loud!
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!
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.
2003 lb7 install was easy. I will say take your time taking the plug apart on older trucks as the plastic components are brittle. Was very impressed with the performance upgrade!
STRUGGLED GETTING THE WIRE PINS ALL THE WAY IN, BUT WHEN I DID EVERYTHING WORKED FINE THE DOWNLOAD PROCESS WAS A BIGGER STRUGGLE IT TOTALY KILLED MY TRUCK, BUT AFTER SERVERAL TRIES IT FINNALLY WENT, SO ALL IN ALL IM VERY PLEASED, THANK YOU
Unsure what tunes I actually have in the truck now, online shows I’d receive 5 tunes at specific hp but I only have 4 tunes that show up on the switch when I cycle through them. I’ve adjusted the stop on the dial to make sure I’m not missing anything but it seems I only have 4 tunes with no idea of what hp they are
DO NOT BUY!! Tune files are stolen from other companies, they have no ability to fix tune issues. These tunes WILL destroy your truck. Beware of using them, use FB forums to find real companies others are using that are reputable. I spent 8 months trying to fix the tuning issues and ended up buying another set of files from a different company and resolved the turbo surging problems. Other companies are cheaper or similar cost, dont cheap out with this Chinese junk and fake tune files.
