Good sound
"I run this muffler on my 7. 3 and it has a very unique sound and tones it down just enough, I also noticed a slight increase in spool time!"
Cummins
Shop All
SKU #: AERO-4040
MPN #: 4040
Aeroturbine Non-Resonated 4.0" In x 4.0" Out Muffler 4040
Description
For those unfamiliar with the Aero line of mufflers, they are a compact stainless steel muffler designed to be added to nearly any exhaust system that offers unrestricted airflow, while having unremarkable sound characteristics. The "Non-Resonated" line of Aero mufflers are designed to offer superior flow, but do not feature the additional resonator that is built into the XL line of Aero mufflers. Due to this, the standard 4040 muffler may develop drone when the vehicle is under certain load conditions, where the XL is designed to cancel this out.
Built from T304 stainless steel inside and out, this muffler does not have any of the traditional packing found in many other mufflers that is known to breakdown over time, but rather uses a series of louvered baffles that are also designed to literally "suck" the exhaust away from the engine, even faster than a straight pipe, which results in lower exhaust gas temperatures.
OPTIONAL CLAMP DETAILS:Ensure your exhaust is secured properly with these 304 Stainless Steel Lap Joint Clamps. These clamps offer a more secure clamping method for the pipes in any exhaust system. These clamps feature a two bolt design that allows you to tighten each side independently of the joint as necessary.
Enter your zip and we'll see if installation is available.
- Request quotes from local installers at checkout
- Compare options and choose the best fit for your install
About WrenchConnected
WrenchConnected is an independent installation marketplace operating in partnership with Diesel Power Products.
How it works
After checkout, we route your vehicle info and part SKU to verified installation shops near you. Local installers review the job and submit competitive bids; you pick the shop you want based on price, reviews, and availability. Your name and email stay private until you select an installer.
Pricing
You pay for the bid from your preferred shop. The full amount is shown before you confirm — installers cannot add charges without your written consent. Payments are processed securely by Stripe.
Your privacy
During bidding, shops see only your service ZIP code, vehicle year/make/model, and the part SKU — not your name, email, or address. Only the shop you select receives your contact details after payment. We never sell your personal information.
More detail at wrenchconnected.com.
SIZING
- 4" ID Inlet
- 4" ID Outlet
- 6" Body Diameter
- 13" Body Length
- 20" Overall Length
About Aeroturbine
For us, there is no question what the answer would be for any of our staff if asked what our favorite muffler is. We have been AN Aeroturbine muffler distributors for over 10 years now and every truck in our parking lot has one of their mufflers installed. Aero Exhaust has been through some turmoil over the past couple of years, but they are BACK! And we are so pleased to be able to offer their superior muffler design again.
For those unfamiliar, these mufflers are designed to create an internal vortex in the exhaust to literally "suck" the exhaust away from the engine, reducing exhaust gas temperatures. Beyond this attribute, these mufflers create a unique sound, and when opting for any of the "XL" resonated versions, they are awesome at cancelling out any drone inside of the cab. And finally, the construction is a work of art. Built out of T304 stainless steel inside and out, without any of the traditional packing used by many other manufacturers that is notorious for breaking down over time.
For those unfamiliar, these mufflers are designed to create an internal vortex in the exhaust to literally "suck" the exhaust away from the engine, reducing exhaust gas temperatures. Beyond this attribute, these mufflers create a unique sound, and when opting for any of the "XL" resonated versions, they are awesome at cancelling out any drone inside of the cab. And finally, the construction is a work of art. Built out of T304 stainless steel inside and out, without any of the traditional packing used by many other manufacturers that is notorious for breaking down over time.
Blog
April 20, 2026
This article covers some of the most common Jeep Gladiator diesel problems, what to watch for, and...
Read MoreJeep Gladiator Diesel Problems: Common Issues Explained
December 22, 2025
Learn how to make your truck louder with exhaust tips, mufflers, and safe upgrades. A clear guide...
Read MoreHow to Make My Truck Louder: Exhaust Sound Tips & Upgrades
May 08, 2024
Journey through the world of diesel truck exhaust systems in this comprehensive story. From cat-back exhaust systems...
Read MoreThe Right Pitch For Any Build: The Top Diesel Exhaust Systems
June 12, 2026
The diesel particulate filter (DPF) on your Cummins engine traps soot before it leaves the tailpipe. Over...
Read MoreCummins DPF Cleaning: Signs, Methods & Tips
Overall rating: 4.6 / 5 from 5 reviews.
AI Generated Review Summary
Summary topics
Review topics: [].
Review highlights
Reviews
Aero all the way
"Very pleased with this muffler, gives my 2015 lml duramax just the right amount of spice"
Great addition
"Looks great , sounds great. Slightly quiets down a straight pipe. But not by much. I have noticed slightly lower EGT’s when pulling a hill. Around town you probably won’t notice the difference. Bought a second one for my other truck. Definitely would recommend"
Great product
"Great product , I just wish it was a little longer in length so that it would be a little quieter."
Anyone looking to quiet down a straight pipe
"Works great, does get rid of some of the drone with out sacrificing the sound. Definitely recommend"