A good exhaust system improves your vehicle’s airflow.  You will also know whether the system is good if the exhaust temperatures are low. However, most people tend to focus on how the exhaust system looks. Although the exhaust’s aesthetic elements are essential, it is crucial to know how the system will affect your engine’s functionality. So, invest in the best exhaust for 6.7 Cummins to improve your vehicle’s functionality.

Top 4 Best Exhaust for 6.7 Cummins – Buyers Guide

The best exhaust systems will make your vehicle run efficiently at different levels and, at the same time, have an aesthetic appeal.

Finding an excellent exhaust system is not an easy task. This is why you ought to be very careful when selecting the system from the market or your local store.

In this article, we have listed four exhaust systems that will work best with your 6.7 Cummins. Read on to find out what is the best exhaust for 6.7 Cummins.

Best Exhaust for 6.7 Cummins

The products we are going to review in this article are as follows:

  • Diamond Eye Performance K5252A
  • Advanced FLOW Engineering 49-02016-B
  • Flowmaster 817621
  • Magnaflow Performance 17003

1. Diamond Eye Performance K5252A

Are you looking for the perfect exhaust for your 6.7 Cummins engine? The Diamond Eye Performance K5252A is everything you wish for in an engine.

This performance engine has the following specifications:

  • Exhaust type- Diesel Particulate Filter Back system
  • Exhaust material- Aluminized steel
  • Exit location- Single passenger side
  • Main tubing diameter- five-inch
  • Exhaust sound level- moderate
  • Exit position- single
  • Outlet type- single
Top 4 Best Exhaust for 6.7 Cummins – Buyers Guide

If you are not afraid of power, this DPF-back system by Diamond Eye is for you. This product is fine-tuned. This means it delivers unrestricted power, and it is tested against competition.  So, its performance is excellent. The DPF-Back exhaust system is easy to install. It comes with a step-wise installation manual that will guide you during the installation process.

Main Features

  • Excellent quality at a fair price
  • Made from premium materials
  • Matches the exact requirements of users
  • Easy to install, approximately two hours
  • Does not require welding
  • Comes with an exhaust pipe muffler delete
  • One-year warranty

Once you purchase the product, it will come with;

  • An exhaust pipe
  • Clamps

If you are a speed enthusiast and would like to turn your car into a lightning-fast racing-car, the best option you should take is the Diamond Eye-s DPF-Back engine. This exhaust system is engineered to provide you with maximum performance and limitless efficiency. So, it is the ideal choice for your 6.7 Cummins engine.

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2. Advanced FLOW Engineering 49-02016-B

The ATLAS DPF-Back exhaust system is another excellent choice for your vehicle. This new system by AFE is engineered to perform in all kinds of environments. It can even perform in extreme environments. This exhaust system is built using mandrel-bent aluminized steel tubing. This makes it to have increased horsepower, maximum flow, increased torque, and lower EGT’s.

Top 4 Best Exhaust for 6.7 Cummins – Buyers Guide

The Advanced FLOW Engineering 49-02016-B is easy to install due to its bayonet-style and the two-piece tailpipe. This exhaust system has a leak-free seal due to the OE-style clamps that provide a maximum sealing area (360 degrees). If you want an exhaust pipe with high performance and value, the ATLAS exhaust systems are a perfect choice.

This exhaust system has the least flow restriction, making the engine reduce gas temperatures and increase the horsepower and torque.

This exhaust system has several specifications. These include;

  • Sound level- aggressive
  • Exhaust type- DPF-Back, single
  • Outlet type- single
  • Tubing diameter- five inch
  • Exit position- rear exit
  • Sound level- aggressive
  • Tip style- seven-inch round angle cut

Main Features

  • Features a leak-free seal made from high-quality OE-style band clamps, which provide a 360-degree sealing surface
  • Uses OE-style bayonet hangers to maintain a stable pipe location when vibration and heat conditions are high
  • Stable OE-style fit due to bayonet tips. These hold the hanger bushing in place for a long time.
  • Easy to install due to the two-piece tailpipe and the bayonet style hangers. The estimated installation time is two hours.
  • The smooth transition bends provide increased horsepower and torque, low turbulence, and lowers EGTs.
  • Constructed using stainless steel to ensure durability
  • Comes with an exhaust tip that has a drain port at the bottom to prevent the system from corrosion and rusting
  • Includes hardware such as band clamps, OE-style bayonet hangers, and flange
  • Provides the least restriction to maximize airflow
  • Improves the vehicle’s performance incredibly
  • It is dyno tested
  • Efficiently reduces the gas temperature of the exhaust system.
  • Limited two-year warranty

The items included in the package are;

  • One band clamp
  • One hanger clamp
  • One over-axle
  • One mid-pipe
  • One band clamp and
  • One tailpipe turnout

All the exhaust systems produced by aFe are tested to ensure that they are of the right pipe size. These pipe feature muffler construction and are mandrel-bent to ensure that their shape and size is maintained. This is critical to ensure smooth airflow with the least amount of restriction. The Advanced FLOW Engineering 49-02016-B exhaust system has all these characteristics, making it the best choice for your engine.

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3. Flowmaster 817621

The Force II DPF-Back stainless steel exhaust system by Flowmaster is ideal for people looking to improve their engines’ performance but do not want to be too aggressive. The Flowmaster 817621 system incorporates mufflers and resonators that have a larger displacement. These control the vehicle’s overall sound and increase its performance but not too aggressive for everyday street driving.

Top 4 Best Exhaust for 6.7 Cummins – Buyers Guide

This exhaust system improves the performance and tone of the vehicle, but the decibel level is subdued. This provides users with a pleasant driving experience.

The Flowmaster 817621 exhaust system improves power, torque mileage, and responsiveness. The sound it produces is perfect for commuter and long-distance driving as it does not draw unwanted attention from law enforcement and neighbors. So, if you wish to show off the muscle of your engine but drive peacefully, this exhaust system is for you.

The specifications of this exhaust system include;

  • Exhaust system type- Diesel particulate Filter Back
  • Sound level- Mild/ stock/ moderate
  • Tubing material- stainless steel
  • Exit configuration- single
  • Exit location- single side
  • Muffler series- Outlaw
  • Diameter- four inch
  • Tip style- five-inch round angle cut

Main Features

  • Increases horsepower and torque
  • Suitable for everyday street driving
  • Tuned on dynamometer
  • Produces mild to moderate sound that is not too aggressive
  • Perfect fitment
  • Comes with hangers and hardware to make installation easy
  • The installation time is about two hours.
  • Single inlet and outlet muffler configuration
  • Constructed using stainless steel for durability

The exhaust system comes with;

  • One left and one right tailpipe assembly.
  • One parts kit
  • One scavenger assembly
  • Two mufflers
  • Six 2-1/2 inch band clamp
  • Six 7/16 inch hanger keepers

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4. Magnaflow Performance 17003

The Magnaflow Performance 17003 exhaust system is made using stainless steel with an additional coat of high temp satin black applied from the tailpipe to the tip. This extra coat is for additional protection of the system.

Top 4 Best Exhaust for 6.7 Cummins – Buyers Guide

The black series DPF-Back system by Magnaflow has a dual side exit and includes mandrel-bent tubing. It also contains optional muffler delete pipes, welded tips that have been inter-cooled, and band clamps.

Fitment of the DPF-Back exhaust system by Magnaflow provides a better gas flow that improves vehicles’ performance. The mandrel-bent steel pipes maintain their shape, which helps them to avoid obstructions. This removes any restrictions on the gas flow.  Also, this exhaust system improves the vehicle’s scavenging capabilities, which increases the horsepower and torque.

The Magnaflow Performance 17003 has the following specifications;

  • Exhaust system type- Diesel particulate Filter Back
  • Sound level- smooth, deep
  • Outlet type- dual
  • Exit position- rear, passenger side
  • Material- stainless steel
  • Exit configuration- dual
  • Tubing diameter- four inches
  • Inlet connection type- clamp-on
  • Muffler height- six inches
  • Muffler width- six inches
  • Muffler length- fourteen inches
  • Muffler shape- round
  • Tip diameter- five inches
  • Tip length- thirteen inches
  • Tip shape- round
  • Tip style- intercooled

Main Features

  • Features a 409 stainless steel built with high-temperature satin black coating
  • Features a 300 series intercooled tips constructed from stainless steel and are black coated
  • Has mandrel-bent tubing for maximum gas flow
  • Features a high-quality design
  • Durable because of the built materials
  • Free gas-flow design to increase performance
  • No welding is required.
  • Installation is straightforward
  • Round stainless steel polished muffler
  • Round intercooled single wall black coated stainless steel tips.
  • Limited lifetime warranty on steel
  • One-year warranty on ceramic coating

The Magnaflow Performance 17003 includes;

  • One muffler
  • Two tips
  • Hardware

Why should you upgrade your exhaust system?

Top 4 Best Exhaust for 6.7 Cummins – Buyers Guide

There are various reasons that may make you invest in an exhaust system that will change your vehicle’s performance and overall look. These include:

Maximizing the system’s efficiency

An engine’s sound and appearance are not the only things you should look for in an exhaust system. These systems make your car’s engine run better. So, select an exhaust that will empower your vehicle’s engine and make it work at its best.


A good exhaust system should be versatile. This means it can quickly adapt to any bed configuration of your truck. Also, even if you buy a new car, your exhaust system should adjust to the new engine.


The appearance of an exhaust system is also critical. If you want to upgrade your truck’s exhaust system, you will want it to look better than the last one. A good exhaust system should look impressive and improve your car’s performance.

Buy Magnaflow Performance 17003 Now!

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Factors to Consider When Choosing the Best Exhaust for your 6.7 Cummins Engine

Buying a high-quality exhaust system is easy or difficult, depending on your approach. To buy the best exhaust for the 6.7 Cummins engine, you should consider the following factors:

1. Installation process

Installing exhaust systems is not as easy as you may think. It is, however, not that difficult. Typically, you will need to go under the car to install the system. That is why the installation process is a huge consideration before buying an exhaust system. In case you are unable to follow the installation guidelines, you can look for professionals to assist you.

2. Noise

The sound produced by the exhaust system is an individual consideration. Some people prefer a loud exhaust system, while others prefer a system that will increase their truck’s functioning but will not attract unnecessary attention to them. Some mufflers are silent while others produce loud trumpet sound.  So, you should figure out the level of sound you want and select a system that will suit your needs.

3. Durability

Exhaust systems go through a lot of hardships and are usually very dirty. So, you should ensure that you invest in a system that will serve you for a long time without the need for frequent repairs.

4. Exhaust manifold

Top 4 Best Exhaust for 6.7 Cummins – Buyers Guide

This is the header of the exhaust made of stainless or cast steel. It is attached to the engine’s head, and it is the first connection between the engine and the entire exhaust system. Hot air from your engine passes through the manifold first before going to the rest of the exhaust system. So, ensure that this part is strong and can comfortably handle high temperatures.

5. Catalytic Converter

Before you buy an exhaust system, ensure that it has a functioning catalytic converter. Some by-laws in every state require all vehicles to have an exhaust system with a catalytic converter. This converter is critical as it converts unburned carbon monoxide, nitrogen, and hydrocarbons to carbon dioxide and water.

6. Price

Top 4 Best Exhaust for 6.7 Cummins – Buyers Guide

Different brands of exhaust systems are priced differently. So, when choosing an exhaust system, ensure that you pick the one that falls within your budget range. To stick to your budget, always do some research and compare the systems’ various features and specifications. This will help you to choose a good system at an affordable price.

7. Manufacturers

Typically, there are different manufacturers of exhaust systems. This means that there are different brands, as well. However, you should be able to trust the manufacturers before buying any product from them. Also, you need to be cautious and check all warranty information beforehand because some manufacturers are not trustworthy.

8. Customers’ Reviews

Another essential consideration you should make is to check customers’ reviews. If you like a particular exhaust system, take the time to go through what previous buyers say about it. This will help you know whether the system is good and provide you with firsthand information about the performance of the product.

You can also go through the FAQs on the manufacturers’ websites to get more information about the product you are interested in.

Parting Shot

With the exhaust systems we have listed for you, making the right decision is now easier. All the listed systems will provide you with a high level, seamless performance. These systems will improve your engine’s combustion and airflow and increase the horsepower and torque of the vehicle.

When choosing an exhaust system, ensure that you value it to determine what it will offer your engine. The appearance of the system is also paramount. After all, you would not want to buy an exhaust system that looks downbeat.

There are many reasons that will make you upgrade from the factory stock system to one of the recommended systems above. So, take the time to think and select an exhaust system that will be best for your vehicle.

It is also essential to trust your gut when looking for these systems. If you have some doubts about a particular exhaust system, do not rush to buy it. Think long and hard before you buy any system.