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USD 151.46
Part #: AEAT4040XL

Aero Exhaust AT4040XL Aero-Turbine Resonated Performance Muffler

Universal - 4" Inlet/Outlet x 26" Length
Part #: AEAT4040XL
★★★★★ ★★★★★ 9 Reviews
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The Aero Exhaust AT4040XL Aero-Turbine Resonated Performance Muffler gives your truck an aggressive, yet more mild tone due to the resonated design. Built for high-output diesel engines, the Aero-Turbine Performance Mufflers feature a patented airfoil technology that increases horsepower, torque, flow and also reduces temperatures. The AT4040XL is the only performance muffler that will give you the performance of a full system at a fraction of the cost. 

Most vehicles have extreme restrictions on exhaust airflow, which increases exhaust temperatures and decreases engine longevity. The Aero-Turbine breakthrough, based on thermodynamics and jet engine technology, literally accelerates the flow of exhaust away from the engine increasing performance and engine efficiency. Featuring a T304 stainless steel construction, this resonator has a high-temperature ceramic packing material to help absorb sound waves.

Features & Benefits:

  • Reduced Temperatures
  • Increased Horsepower 
  • Increased Torque
  • Increased Fuel Economy 
  • Resonated Design - For Milder Tone 


  • Resonated Muffler
  • 4" Inlet/Oulet 
  • 26" Overall Length 
  • Center Inlet/Outlet


  • MFG. Number AT4040XL
  • Manufacturer Name Aero Exhaust
  • Shipping Weight 7.00 lb.
  • Shipping Length 10 in.
  • Shipping Width 35 in.
  • Shipping Height 12 in.
  • Fuel Type Diesel / Gas
  • Warranty Yes
  • Warranty Info Manufacturers Lifetime
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
4.4/5 Stars out of 9 Reviews
Good Quality
(Illinois) | December 8th, 2019
Easy installation. Does not effect the diesel rumble but eliminated the cab drown. Would buy again.
Excellent Choice!!!
(Winchester, VA) | April 10th, 2019
I've got a 16 Ram 6.7 Cummins that had 4" straight exhaust and it was a little too loud, especially for my neighbors when I started it at 5am. I wanted a good flowing muffler that was quieter than straight pipe, but something that would retain a good sound. This is it, in fact I think it sounds better. This muffler gives the exhaust a very low deep tone and removes the higher pitch sounds if that makes sense. I couldn't be happier with the way my truck sounds.
Awesome Muffler, 2003 Cummins
(Tucson, AZ) | February 17th, 2018
Installed on my 03 Cummins. I had the Silverline muffler previously. I wanted less drone in the cab at highway speeds and towing. This muffler is it! it gave my Cummins a totally different sound in a good way. It has a melow rumble but when you put your foot into it, it comes alive. I am really happy with this muffler. Excellent choice if you are looking for a quiet cab ride combined with a great sound.
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Questions and Answers

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Most Popular Questions

Is the length on this from flange to flange or is it just the muffler part?
View Staff Answer 
The measurement would be end-to-end.
Will this fit on a 2004 Holiday Rambler MotorHome with a Cummins 400HP ISL Diesel?
View Staff Answer 

The AERO EXHAUST AT4040XL AERO-TURBINE RESONATED PERFORMANCE MUFFLER is a universal muffler designed for 4” exhaust piping.

What is Body Diameter What is the body Diameter ?
View Staff Answer 

The AERO EXHAUST AT4040XL AERO-TURBINE RESONATED PERFORMANCE MUFFLER has the following measurements: 4" ID Inlet, 20" Body (6” Diameter), 4" ID Outlet w/ a 26" Overall Length.

Is the 4” Inlet/outlet an I.d. Or o.d.?
View Staff Answer