6 Best Exhaust Systems For 6.7 Cummins Reviews

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An exhaust system serves many functions. In layman’s terms, it has been designed to remove all the toxic gases that are produced in the engine.

But it can do a lot more. The removal of these gases decreases the pressure on the engine, allowing it to perform better. You also get better fuel consumption.

If you are an owner of the 6.7 Cummins, then you will definitely benefit from the last option.

Regardless, this article will take a look at the top products on the market and will award one of them as the best exhaust for 6.7 Cummins.

There is an included buying guide for people who cannot make a decision. So, without any further ado, let’s start!

6 Top Rated 6.7 Cummins Exhaust Systems Comparisons

Diamond Eye K5252A Exhaust Kit

Diamond Eye K5252A Exhaust Kit

MBRP S5248409 Cat Back Exhaust System

MBRP S5248409 Cat Back Exhaust System

MBRP S61340PLM Exhaust System

MBRP S61340PLM Exhaust System

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

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

Magnaflow 17069 Cat Back Exhaust System

Magnaflow 17069 Cat Back Exhaust System

Banks 49775-B Exhaust System

Banks 49775-B Exhaust System


1. Diamond Eye K5252A Exhaust Kit

Diamond Eye K5252A Exhaust Kit
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11/09/2023 03:48 pm GMT

Arriving in the first place, taking the lead over all competitors, is the K5252A Exhaust Kit from the Company Diamond Eye.

There is a good chance that you may not have heard of this company or any other on this list, for that matter.

The reason for this is that exhaust system brands rarely advertise themselves. But trust me when I say that they are the best on the market.

This 5-inch exhaust system has been designed to improve the performance of your engine in a considerable and noticeable way.

It has been designed for the 2007 to 2012 variants of the engine. So, if you were an early adopter, then this exhaust kit will be more than perfect for you.

The manufacturer promises many things, with one of the major features that this exhaust promises, the most important ones are improvement in engine performance and the overall sound.

You will get that mellow tone that many people love. If you are getting a new exhaust system just because of the sound, then you are going to love this upgrade.

Manufacturers normally avoid talking about the design of their products. Well, Diamond eye has made sure to keep itself apart from such companies.

They have CNC machined this exhaust kit to perfection. The tubing has been mandrel bent to get tighter turns without sacrificing the durability of the product.

Thanks to the hard work of the engineers at the company, this exhaust kit is non-restrictive, unlike the stock exhaust system of the engine.

Apart from one customer complaining about being sent a beat-up package, which is the responsibility of the shipping company rather than the brand, there were no issues reported by the buyers.

The company has made a stellar product.

  • Designed for early variants of the engine
  • Improvement in engine sound
  • Better overall performance
  • CNC machined; mandrel bent tubing
  • None

Diamond Eye has created an amazing product that has no defects or drawbacks. It is the perfect product for your 6.7 Cummins engine.

2. MBRP S5248409 Cat Back Exhaust System

MBRP S5248409 Cat Back Exhaust System
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11/09/2023 04:59 pm GMT

Taking up the second spot is another amazing product, this time from the manufacturer MBRP.

The company makes some amazing exhaust systems, and this MBRP S5248409 Cat Back Exhaust System is no different.

With 35 buyer ratings, it comes pretty close, in terms of performance, to the previous exhaust kit.

Let’s take a closer look into what it can do! Well, the product description is as generic as it could be.

Instead of providing some insight into what this exhaust kit can do, the company has summed up what its products normally can do.

I managed to get some information after further research, which I am going to share with you.

This exhaust system, like most out there, has been designed to remove all the restrictions in the engine.

As compared to the poorly designed stock kit, this one will allow you to get noticeable gains in performance.

You can expect improvements in both the horsepower and torque. The manufacturer promises much more with this exhaust system.

As the process of removing the gases will be quick and more efficient, the fuel consumption of the engine will also be improved.

Let’s focus a bit on the sound! As this is a cat back exhaust system, it has been designed to be as loud as possible.

You won’t be waking up your neighbors, but you are going to love the sound gains that should go with this engine’s performance.

Somewhere along the shipping lines, the product was damaged badly for more than one user.

Buyers reported about receiving products that not only had an open box but with bent pipes, making the units useless.

This is something that the company should investigate as soon as possible.

  • Better horsepower and torque
  • Improved sound
  • Better fuel efficiency
  • No restrictions
  • Damaged on arrival

Yet again, this company has fallen victim to shipping issues.

It should look into this matter and solve it as soon as possible because what is the point of making a good product when they will not be able to experience it.

3. MBRP S61340PLM Exhaust System

MBRP S61340PLM Exhaust System
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11/09/2023 09:18 am GMT

Well, what do you know?

Coming in third place is another product from the company MBRP.

If you had any doubts about the quality of the previous product, they must all be alleviated, with the MBRP S61340PLM Exhaust System coming in the next spot.

I don’t know about you, but I find this quite impressive. Let’s see what features this exhaust system brings to the table.

Before I continue, I must clarify that this exhaust system comes with a muffler delete.

What this means that it will be extremely loud, and the lack of a muffler also means that it is illegal to drive in the USA.

The system has some pretty amazing features. With full aluminum construction, the manufacturer has done a good job at making this exhaust system durable.

No matter the environment, this kit will hold on pretty well.

As this exhaust system has been designed to keep the back pressure on the engine close to zero, it comes with a two-piece tail pipe instead of one.

This alone shows you that the stock exhaust system on the 6.7 Cummins is really not good at its job. The manufacturer has also added a one-year warranty with this exhaust system.

This must be great news for many of you, and it also means that the buy is completely risk-free.

If, within a year, any faults arise that were not caused by you but came from the factory, then you will be able to get a replacement unit without any additional cost.

This MBRP exhaust system scored a solid five stars. The only drawback is that it does not have a muffler, making it illegal in the USA.

Some of you may find the no muffler design good, but it is not good for the cops to not be in your good graces. You can expect a heavy fine if you get caught.

  • Huge improvements in performance
  • Extremely loud sound
  • One year warranty
  • Two-piece tail pipe design
  • Illegal in the USA

As the aim of this article is to focus on performance, that is the reason for this exhaust system earning third place. You should also consider getting an exhaust that has a muffler.

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

aFe Power 49-03069-P ATLAS Performance Cat-Back Exhaust System
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11/10/2023 02:39 am GMT

I don’t know about you, but aFe is the only company on this list that I know about. In fact, I have had the opportunity to check out several of the company’s products before in my article.

They know what they are doing, and the same can be applied to this aFe Power 49-03069-P ATLAS Performance Cat-Back Exhaust System.

Don’t believe me?

After reading through the gains it offers, you will surely be convinced. This is the first product in this article that allows you to customize which tip you want.

You can choose from a shiny, polished one or go full stealth with a black tip. Both look great, and no one is better than the other.

The tip has been created from stainless steel. It has been laser cut for maximum precision. It has a 6’’ diameter. This means that you will not have to worry about it restricting the airflow.

The durability of this cat back exhaust system is top-notch. You have an option to choose from aluminum and a steel build.

The tubing is mandrel bent. Mandrel bending is the process of bending the tubing in such a manner to make sure that the structure is not compromised.

This exhaust system has a single in and a dual out muffler.

Yes, unlike the previous one, this one does not have a muffler delete, so you don’t have to take too much tension of running into issues with the authorities.

The design is non-restrictive, which means that there will be less pressure on the engine, which allows it to perform better and efficiently.

You can expect significant gains in performance and fuel efficiency.

There is one complaint that I found out related to the exhaust system, which is that the company does not provide nuts and bolts, which are needed for the process.

As the factory ones are welded completely, buyers have to spend more to get the exhaust installed.

  • Different buying options
  • 6’’ tip for no restrictions
  • Mandrel bent tubing
  • Single in and dual out muffler
  • No hardware included in the box

If only aFe had included this basic hardware in the box, this ATLAS exhaust would have easily topped this article.

5. Magnaflow 17069 Cat Back Exhaust System

Magnaflow 17069 Cat Back Exhaust System
We earn a commission if you click this link and make a purchase at no additional cost to you.
11/09/2023 01:13 pm GMT

Looking to get huge gains in performance?

Then you should definitely check out this Magnaflow 17069 Cat Back Exhaust System.

The company is one of the most know exhaust manufacturers out there, so there was little doubt that it would not make it onto this list.

At almost double the price of some competitors on this list, this exhaust should work really well.

Well, the brand claims that it is one of the best on the market, thanks to its 5” diameter.

The manufacturer compares the sound of this exhaust system to the ease of installation. Both are close to zero.

That is impressive and is also good news for those who want to upgrade the exhaust system without getting the accompanying loud roar.

The manufacturer has also included a DPF or diesel particulate filter. It will allow you to replace the stock exhaust all the way from the rear of the filter.

The brand has also included a 6-inch tip, which means that you will not have any complaints about the engine not performing up to par.

Just like the previous exhaust system, this one has a single in, dual out design.

You are removing maximum back pressure from the engine. And before you ask, the exit of this exhaust system is the rear side of the passenger side.

Let me put all of this in easy words. You can expect great improvements in horsepower and torque. The sound will be great and will be quiet enough that it won’t get annoying.

It is also very easy to install.

The only issue users faced with this exhaust kit is that the coating used is very thin. This means that it can get scratched up pretty easily.

Other than that, it is expensive, almost double than other products on this list.

  • 5’’ diameter for optimal flow
  • Single in dual out design
  • Massive improvements in performance
  • 6-inch tip for no restrictions
  • Easily scratchable
  • Expensive

If budget is not an issue, then you should definitely consider this exhaust system. It checks all of the boxes of a good product and will keep you satisfied for a long time.

6. Banks 49775-B Exhaust System

Banks 49775-B Exhaust System
We earn a commission if you click this link and make a purchase at no additional cost to you.
11/09/2023 03:38 pm GMT

This article has finally reached its end with this sixth and final product. The Banks 49775-B Exhaust System is a decent product.

The fact that it has earned the last spot does not mean it is a bad exhaust system. It has some good features that you will appreciate.

This exhaust kit has been designed for the 2013 to 2018 variants of the engine.

So, if you don’t have the latest and greatest, you don’t have to worry because the performance increase you will be getting will breathe new life into the engine.

The exhaust kit has a 4-inch diameter. It is lesser than other exhausts on this list but is still good enough. Durability is an issue that many users worry about.

Well, this exhaust is made up of stainless steel, which is the best choice of material out there.

The manufacturer guarantees that thanks to the mandrel bent tubing, the back pressure on the engine will be kept quite low.

And yes, you will not have any clearance issues when installing this kit.

Whether it be the spare tire or the brake lines, the company has worked hard to create a product that will not cause any issues.

Unlike the last two kits, this one has a single exit design.

There will be no intermediate pipe for the 2014 variant of the engine. This will not affect performance in any meaningful way, so you don’t have anything to worry about.

This exhaust kit has no ratings. Although Banks is a trusted brand, there being no feedback means that the product has not been tested enough to draw conclusions.

This is the reason it has been awarded the last place on the article. Apart from that, I could not find any other issues with this exhaust kit, which is certainly good news.

  • 4-inch diameter for optimal flow
  • Mandrel bent tubing
  • Stainless steel build
  • No ratings

If this exhaust kit is anything like what is described on paper, then you will have a great and memorable experience with it installed in your truck.

What To Look For When Buying An Exhaust For Your 6.7 Cummins

Generally, people tend to focus on how the exhaust system bumps up the car’s horsepower.

While this is the general goal, you need to know how the exhaust achieves this.

This is even more so when dealing with a 6.7 Cummins engine.

If you are looking for the reliable exhaust for your 6.7 Cummins engine, you should consider the following factors.

  • The Noise It produces
  • Exhaust Manifold
  • Catalytic Converter
  • Statistics And Tests

The next part of this guide will briefly address each of these factors’ importance.

If you are unaware of the importance of any of the features mentioned, then you should definitely read the article until the end.

The Noise It Produces

The sound produced by an exhaust system is a variable consideration because it depends on your preference.

Some people like their exhausts to be loud, and some prefer better functionality without extra attention. The 6.7 Cummins supports all kinds of exhaust systems.

Therefore, you should decide what noise you want from the exhaust system. If you can, get a test sound of the exhaust system before you buy it to match your interests.

This will ensure that you are completely happy with the product.

Exhaust Manifold

The header of the exhaust or the exhaust manifold is attached to the 6.7 Cummins head. It is the first and main connection from the engine to the exhaust system.

The hot air produced by the 6.7 Cummins is passed through the manifold to the rest of the system.

Make sure this part is made of a strong material like stainless steel or cast steel so it can handle high temperatures.

You will also want the manifold to have a high diameter to increase the airflow.

Catalytic Converter

This is responsible for converting all the toxic gasses produced by the 6.7 Cummins, like carbon monoxide and other hydrocarbons, to carbon dioxide and water.

Most states have by-laws that enforce every car’s exhaust system to have a working catalytic converter.

So before you buy an exhaust, ensure it has a functional catalytic converter. You might also want to get a high-flow variant, as they are typically less prone to getting clogged.

Improvements And Tests

If you are interested in a particular exhaust system for your 6.7 Cummins, consider all the improvements it brings.

This is usually in the form of airflow improvement and an increase in hp.

Doing so will ensure the performance of your chosen exhaust system and provide first-hand information about the product.

Exhausts also go through performance testing. The results of these tests should also show you how good exhaust is.

There can be many reasons why you might want to upgrade from the factory stock exhaust system to a better one.

So when choosing an exhaust system, determine how it will improve your 6.7 Cummins’ performance and value it accordingly.

Its looks are also important; you do not want an exhaust that looks gloomy. But do not go for just looks. It should improve your 6.7 Cummins’ airflow and combustion.

Frequently Asked Questions

Q1. How Much Does It Cost To Install An Exhaust In 6.7 Cummins?

If you thought that you would be able to install the exhaust kit on your own, well, I have some bad news for you. You may need to go to the mechanic because the process is not that simple.

Unless you have a helping hand and prior experience, you can expect to spend around $500-700 more to get the exhaust installed on your 6.7 Cummins engine to get the performance increase you want.

Q2. Can I Install An Exhaust Myself In 6.7 Cummins?

Of course, you would need an answer to this question after you learn that the install is going to cost you this much.

Well, the first thing you need is a lot of tools, too many to be listed here. You also need excellent ground clearance for a good view.

Lastly, patience is required. Although the job takes an hour or two, it is tricky. If yes, then you can install the exhaust system yourself.

Q3. How Does The Exhaust Brake Work On 6.7 Cummins?

Now, this is an excellent question. The E Brake on the engine utilizes the pressure on the exhaust system to improve the vehicle’s braking ability.

What the engine basically does is restrict the flow of gases, which increases resistance for the pistons.

This reduces the crankshaft resistance and hence allows the brake to work more efficiently. This truly is an incredible system and is found in very few engines.

Q4. Will Bigger Tips Make An Exhaust Louder In 6.7 Cummins?

A very common misconception is that tips will make the exhaust louder. This is completely false.

After a lot of research, it is easy to conclude that tips will not do anything to alter the sound of the engine.

Unless the original tip was causing restrictions, a new one would not make a difference. There may be an increase in the drone of the engine, which is common in the 6.7 Cummins.


What should I look for when buying an exhaust for my 6.7 Cummins engine? Read my blog to get the most reliable one

So, there you have it guys, my take on the top exhaust systems for your engine.

I know that some of you may still be confused with what exhaust to get, and I hope that the above-written buying guide will help you out.

As promised in the description, I will be awarding one of these systems as the best exhaust for 6.7 Cummins.

Well, the winner is the Diamond Eye K5252A Exhaust Kit. It easily takes the lead overall competitors.

What I can assure you is that whatever kit you choose, as long as it is from this list, you will be more than pleased with the performance.