5 Best Exhausts For 6.7 Cummins in (2024) (HP & Torque)

Getting an exhaust system is one of those essential replacements that it’s best to get done with early on. Many people never change the exhaust system until it’s truly not performing (either rusted or worn out), but the real pros know that replacing the stock exhaust system early on for a more efficient and durable one can boost the entire vehicle’s performance. 

This is because getting a better exhaust system directly impacts the performance of your 6.7 Cummins and lets this powerful engine really do its thing completely unencumbered with a heavy and clogged exhaust system. Think of the exhaust system as your car’s respiratory system while the engine is the heart. When your truck is breathing better, the engine has a better chance at using all of its horsepower and torque without anything getting in its way. 

Top 5 Best Exhaust For 6.7 Cummins

It can be difficult to choose the best exhaust For 6.7 Cummins in the market since there are so many competitors. One of the biggest hurdles to purchasing an exhaust system online is that there’s a good deal of ambiguity surrounding which exhaust system is compatible with which engine. That’s why we’ve done our research and homework to compile this list for you. 

Not only are all the exhaust systems on this list compatible with your powerful 6.7 Cummins engine, but are also the tried and tested superior exhaust systems at every price range so that you can find the perfect exhaust system for you and your vehicle. 

damaged 6.7 downpipe
Source: reddit@spencera99

Be sure to check out the Buyers Guide that we’ve included at the end of this article. It can be confusing to read through the reviews and only see a couple of features listed out — and the buyer’s guide can help you understand what exactly each feature means and what it can do for you as compared to an exhaust system that is not equipped with said features. 

1. Diamond Eye K5252A Exhaust Kit

Diamond Eye KIT 4in CB SGL AL: 2004.5-2007.5 DODGE CUMMINS 600

We usually highlight the high-end exhaust systems in our top picks. However, this Diamond Eye exhaust system is so impressive with its features at a budget price that we had to include it as a top pick. It’s perfect for someone who doesn’t want to commit for a decade to their truck, and this exhaust system will serve you well for a few years and provide a decent performance boost. 

This exhaust system reduces EGTs and improves the horsepower and torque of your 6.7 Cummins. The material itself is made from a blend of stainless steel and highly aluminized material so that you can enjoy the perfect blend of strength and durability. You’ll also enjoy an improvement in fuel mileage. Who doesn’t want to save money on gas? 

The efficiently bent system keeps the vehicle cool and expels all contaminants in the quickest and coolest way. It’s also easy to install on your own. 


  • Manufacturer: Diamond Eye
  • Model: K5252A
  • Weight: 45.2 pounds
  • Dimensions: 52 x 21 x 13 inches


  • Affordable
  • Durable material
  • Reduces backflow restrictions
  • Improves fuel mileage


  • No anti-corrosion
  • Average sound

2. MBRP S5248409 4

MBRP S5248409 4' Cat Back, Single Side Exit Exhaust System (T409)

MBRP is known for making some of the best high-end exhaust systems in the market. This model has incredible performance and the most tangible difference when you take your truck out for a spin. 

This single-side exhaust system produces magnificent sound. If you’re someone who cares about the sound that your truck makes, and you want it to look fitting of your massive pickup truck, this exhaust system is the one for you. It’s definitely a big improvement from the stock exhaust system. 

It also has highly-durable materials used with a mirror finish that ensures you’re not going to be running into your old enemies Rust and Corrosion any time soon. An anti-corrosion finish can go a long way in ensuring that your single side exit exhaust system lasts you a long time and doesn’t give up on you before its natural life span, no matter what the weather conditions are. 

You also enjoy a lifetime warranty with this one, so that should get rid of any doubts about its performance!


  • Manufacturer: MBRP
  • Weight: 55 pounds
  • Model: S5248409
  • Compatibility: F-150,F-150,F-150,F-150*:*4


  • Easy installation
  • Extremely durable
  • Great powerful sound
  • Improves horsepower and torque significantly
  • Anti-corrosion
  • Lifetime warranty


  • This is not a budget exhaust system

3. Performance 5

MBRP S61340PLM Exhaust System

This is the best dual system exhaust system in the market. A dual system exhaust system with dual exits means that it’s even more efficient and powerful in getting rid of air, gas and other contaminants. 

It works with pickup trucks with a short or long bed and is also one of the most compatible exhaust systems on our list. You don’t even need a muffler with this exhaust system since it already comes equipped with high-quality polished tips. The sound of this exhaust system is something we cannot go without mentioning. It’s a loud and deep rumble that will probably let your neighbors know when you’re taking the truck out, but since it’s so pleasant we’re betting no one is going to complain!


  • Manufacturer: MVP


  • Easy bolt-on installation
  • Dual exhaust system
  • Highly polished tips
  • Great powerful sound
  • Durable and high-quality
  • High diameter


  • No anti-corrosion facility

4. aFe Power 49-03069-P ATLAS Performance Cat-Back Exhaust System

aFe Power 49-03069-P ATLAS Performance Cat-Back Exhaust System

Alright, we get it. Why be subtle when you can be powerful? If you feel like you need to have the best, most intimidating and most aggressive sound system from your exhaust: we have just the exhaust system for you. You’ve got a pickup truck that’s worth the double-take, so why leave unnoticed? This powerful exhaust system lets out a low-pitched roar that’s intimidating and forces other people to take you seriously. And, why shouldn’t they, with a truck like that? 

But this exhaust system isn’t just bark and no bite. It’s also incredibly powerful with efficient gas and air expulsion. What’s more, it looks great when installed on your vehicle due to its finish and polishing. 

This 5inch wide exhaust pipe is made from highly aluminized material that will also be by your side for many years to come with its anti-corrosion facility. If you thought it couldn’t get better, here’s this: the easiest installation on this list. You just have to mount this exhaust system onto your vehicle and you can probably get it done within 10 minutes. It doesn’t get much better than this!


  • Manufacturer: ATLAS
  • Model: 49-03069-P
  • Weight: 53 pounds
  • Attachments: All Hardware Included


  • Magnificent sound
  • Anti-corrosion
  • Durability
  • High performance
  • High quality
  • Mandrel bends
  • Leak free
  • Performs well at high vibrations and speeds


  • Not a budget exhaust system

Check out! Our article on Top 5 Best Exhaust For 6.7 Powerstroke.

Buying Guide: Which features to consider in the best exhaust for 6.7 Cummins? 

If you’re keen on getting the best exhaust system that money can buy, we’d recommend that you take a few minutes to read through this article. Picking any high-end exhaust system may not be the best approach for you, since many exhaust systems are specifically designed for a specific need, like towing, hauling or racing. 

You might find that all the exhaust systems on our list seem like a decent pick — and they certainly are. Having said this, only one of the exhaust systems can be the best pick for you, if you consider the price and other factors that will help you make your decision. 


This is arguably the most important factor when it comes to picking the best exhaust system for your 6.7 Cummins. While it’s easy to say that you should opt for a high-end exhaust system since that’s the best, this may not be the best advice for everybody. 

If you’re someone who has already shelled out quite a bit in terms of fittings for your truck, you may not be prepared to part with the big bucks for an exhaust system. You also have to look at your level of commitment to your truck. If you’re planning to spend another decade or so with the love of your life (yes, we’re still talking about your truck), then it makes sense to invest in the best exhaust system since you’ll need the durability factors. 

However, if your heart is set on another (still talking about trucks!), then getting a budget exhaust system can help you improve your current ride for the time being without committing too much. 

Installation Process: 

You’ll notice that we’ve included whether there is easy installation or tricky installation with each product review. This is because installation is a big factor to consider when ordering the exhaust system for your 6.7 Cummins. Some exhaust systems are easier to install than others, and some will actually recommend that you hire a professional to do the job for you. 

Needless to say, we’re partial towards the exhaust systems that have easy installation. This is because they can be performed in under an hour, and also save you money. It can cost quite a bit to hire a professional to come home and install an exhaust system to your vehicle, and this may not be an extra cost you’re happy to part with — especially if you know you could’ve done it yourself. 

Sound and Noise: 

There are different kinds of people who are in the market for an exhaust system. A good chunk of those people are looking for a loud and powerful exhaust system, and we don’t blame them! Having a massive pickup truck is impressive for the eyes, but a low and loud intimidating growl to accompany it is the icing on the cake. Your pickup truck is big and bad and doesn’t need a kitten squeak coming from underneath it!

That’s why sound is so important in an exhaust system, and we’ve included this aspect in all of our product reviews on this list. We’ve only selected the products with a good all-rounded sound, but there will be minor differences in the volume of that sound. Some exhaust systems are specifically designed to deliver an impressive sound so you don’t have to worry about anyone forgetting that you own this pickup truck!

Others have good sound but it’s also quite understated. If you don’t want to wake the neighbors, or you’re just a sophisticated and understated kind of guy, this might be something you’re more comfortable with. 


Like the price, durability is also another factor that makes you reevaluate your relationship with your truck! Higher durability almost always comes with a higher price, so you have to understand how long you’re willing to commit to this vehicle. It does not make sense to go for a high-end highly durable exhaust system if you’ve set your heart on upgrading to another pickup truck in the near future. 

Having said that, durability is always a good thing. You don’t want to spend precious time and money acquiring the best exhaust system only for it to go rusted in a few years. Rust and corrosion is one of the biggest killers of a perfectly functioning exhaust system so we recommend that you look for materials that are anti-corrosive or have an anti-corrosion finish. 

Frequently Asked Questions about Exhaust Systems for 6.7 Cummins

You’re not alone in this quest for the perfect exhaust system for your 6.7 Cummins. There are many others on the internet in search for the best exhaust system that will allow your 6.7 Cummins to shine, and we’ve collected the most commonly asked questions and answered them over here so that you can be sure you don’t have any lingering doubts or questions in your mind. 

We want you to be sure about your decision, so we recommend that you read through this Frequently asked questions section in addition to the Buying Guide section.

Which is better 4 or 5 inch exhaust?

The choice between a 4 or 5-inch exhaust depends on your vehicle’s needs and performance goals. A 4-inch exhaust is suitable for most applications, while a 5-inch exhaust is ideal for high-horsepower, heavy-duty trucks that require better exhaust flow and lower exhaust gas temperatures.

What should I upgrade on 6.7 Cummins?

Upgrades for a 6.7 Cummins can include a cold air intake, high-flow exhaust, performance tuner, upgraded fuel system, and aftermarket transmission components. These modifications can improve power, fuel efficiency, and reliability.

Is a bigger exhaust better for diesel?

A bigger exhaust can be beneficial for diesel engines by reducing exhaust gas temperatures and backpressure, which can improve engine performance, fuel efficiency, and turbocharger response. However, excessively large exhaust systems can cause a loss of low-end torque.

What is the best delete kit for 6.7 Cummins?

The best delete kit for a 6.7 Cummins depends on your performance goals, budget, and local regulations. Research reputable brands and consult experts or online forums to find a kit that best suits your needs. Keep in mind that removing emissions equipment may void warranties and be illegal.

Can an exhaust system help my engine’s HP and Torque? 

An exhaust system can absolutely have an effect on the horsepower and torque of your 6.7 Cummins. You have to understand the damage that a clogged exhaust system can do to your engine. Having an inefficient exhaust system due to either too many bends in the exhaust pipes or the pipes being too narrow, there can be a lot of trapped air and gas. 
Getting the right exhaust system will help your vehicle breathe and let your engine do its ultimate best work — thereby improving both the horsepower and the torque. 

What comes out of an exhaust system in a 6.7 Cummins? 

This is a great question. There are quite a lot of substances that are expelled in an exhaust system, and that’s why they are specifically engineered to expel these substances as fast and efficiently as possible.
You’ll typically find lots of contaminants like carbon monoxide, carbon dioxide, and even a good deal of water vapor that’s leaving the exhaust pipe under your vehicle. 
Additionally, there’s also a good deal of nitrogen and sulfur dioxide that can be found. 

You’ll typically find lots of contaminants like carbon monoxide, carbon dioxide, and even a good deal of water vapor that’s leaving the exhaust pipe under your vehicle. 

Additionally, there’s also a good deal of nitrogen and sulfur dioxide that can be found. 


We hope we were able to help you make your decision to equip your 6.7 Cummins engine with the best exhaust system in the market. Getting the best exhaust system can completely revamp the driving experience of your pickup truck. 

Many pickup truck owners who purchased exhaust systems off this list almost feel as if they’ve replaced the engine itself, since there’s such a tangible difference in the ride and horsepower. Good luck!

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