Best Diesel Tuner For 6.7 Cummins (2020 Update)

The 6.7L Cummins is an engine with incredible performance potential; the 2019 model year revised Cummins reached new limits and set an industry record of 1000 pounds of torque! While it's quite the powertrain, these 6.7 Cummins tuners can still kick it up a notch!

Even with the DPF system in place, you will be stunned by the transformation of your truck!

Our Top Picks for Diesel Tuners For 6.7 Cummins

  • Fits '98.5-18 Cummins
  • TPMS & Tire Size Options
  • Adjustable Speed Limiter
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  • Nearly every PID available
  • Competition Tunes available
  • Shift on the Fly!
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  • Backup-Camera Integration
  • Compatible w/ '94+ Cummins
  • Windshield Mount Included
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Comparison of the Best Tuners For 6.7 Cummins

  • Simple OBDII Installation Takes 10 Minutes
  • Capable of Storing 10 Custom Tunes
  • Revered by Powerstroke Enthusiasts Globally
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  • Maintains warranty without flashing your ECU
  • Loaded with Safety Features to Protect You and Your Powerstroke
  • Easy 20 Minute Installation
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  • Offers instant tune delivery via cloud
  • Custom Tunes offer maximum potential
  • Includes LIFETIME support for tunes
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  • Endless customization options for dashboards, PIDs, backgrounds, and more
  • Retreives the most extensive list of PIDs among tuners
  • Revised hardware makes for lighting fast responsiveness
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  • Datalogging and Diagnostic Capabilities
  • Wi-Fi Updates and Tune Delivery
  • Supports up to 10 Custom Tunes
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What Should I Look For When Buying a Tuner For a 6.7 Cummins?


The 6.7 Cummins is an engine capable of performing at incredible levels. Towing, racing, and off-roading are all possible, but before going out and buying any tuner on the market, it's crucial to look for a tuner that has a good reputation. As you'll notice below, nearly all tuners we recommend for Cummins trucks are Smarty Tuners. Reason being, they have held this reputation of developing good, safe tunes since the early days.

Variety of Tunes

The 6.7 Cummins is a versatile engine with many different uses, so having a tuner that's accomodating to that is important. If you plan to use your truck for towing, racing, and saving fuel on regular roads, you'll be happy to know most tuners these days offer a separate tune for each of these situations.


It's very important to track key vehicle parameters with a quality monitor, especially if a vehicle has a tune flashed on it. A lot of people buy certain tuners for their monitors, and there are also monitor only devices on the market like the Insight CTS3. Monitors are borderline necessary if you wish to track what your truck is doing, especially if you tow.


Features such as shift-on-the-fly, diagnostic capabilities, or manual regeneration can make a difference in your decision. You should look for a tuner with features that cover your needs, instead of purchasing a tuner with features you deem to be unnecessary.

Quick Take - Best Tuners For 6.7 Cummins

Before you get too far, here are the three best tuners for 6.7 Cummins: 

  1. Smarty Touch
  2. MM3 Tuner w/ GDP Custom Tunes
  3. Edge Insight CTS3

Review of the Best Tuners For 6.7 Cummins

The 6.7 Cummins has exceptional high-performance potential. With these tuners, you'll be able to unleash that potential!

Best Plug & Play Tuner:
Smarty Touch


  • Gauges update quickly, providing real-time information
  • Read and clear diagnostic trouble codes
  • The data logging feature lets the user track and keeps notes on the truck
  • The UDC add-on software allows the tunes to be adjusted for aftermarket modifications


  • Certain models may require the Smarty Com-Mod Communication Module

What Other Cummins Owners are Saying

Smarty Touch, despite coming with preset tunes only, improves power and torque very well. The throttle becomes a lot more sensitive, and the truck accelerates quite well when you need it to. Installation takes a few minutes only, the same as loading a new tune. The screen looks clean, and it automatically adjusts to lightning. Many customers have noticed a slight mileage improvement next to the truck running smoother.

Why it Stands Out to Us

There are quite a few features that make Smarty Touch stand out from the rest. The first one being the UDC add-on software which allows for aftermarket modifications. After installing modifications and the UDC add-on, you can tweak the truck's parameters as needed and get the best possible tune.

The device is also the quickest in the industry. The display starts up in a couple of seconds, quick plug and plays installation, and the ECM updates are three times faster than the competition. The Smarty Touch has four customizable dashboards and five different gauge layouts. The gauges are quite effective as they provide information in real-time.

Bottom Line 

The perfect all-around tuner for the 6.7 Cummins is a Smarty Touch! With so much possibility of adjustment and customization, you can unleash the power of your truck in a way that you desire. With this device, you'll enjoy driving just a bit more than before.

Best Custom Tuner for Cummins:
MM3 Tuner w/ GDP Custom Tunes


  • Shift-on-the-fly capability
  • Micro SD card can store multiple GDP custom tunes
  • Ability to track and monitor vehicles parameters in real-time
  • Tune multiple trucks with a single MM3 device at the same time
  • The display and the controller each have their individual CPUs


  • A few customers have had trouble with the installation

What Other Cummins Owners are Saying

The possibility of tuning multiple trucks with just one device and custom tunes on top of that is exceptional. GDP tunes are the way to go if you want to take full advantage of your vehicle upgrades. They work very quickly and efficiently. Many customers claim that their trucks have never run better. 

Why it Stands Out to Us

The MM3 tuner is a great platform with many advantages and little to no disadvantages. What stands out is the ability to tune multiple trucks with one device. The tuner stores up different Vins, one license upon installation, and additional licenses can be ordered as needed.

The custom-built tunes from GDP are quite impressive, and they take into account every upgrade you've made to your truck. The device is internet-updatable, and it updates quickly. Four dashboards are configurable with five different gauge layouts. Highly customizable, and they allow for tracking and monitoring of parameters in real-time.

Bottom Line

Excellent device with custom tunes tailored to your truck made by the best. The MM3 is a great tuner, and if you own or plan on owning multiple trucks, there's nothing better on the market than the MM3 tuner with GDP custom tunes!

Best Monitor-Only Option:
Edge Insight CTS3


  • Endless customization possibilities
  • Clean and simple look without the tacky and bulky cables
  • Light sensitive monitor adjusts the brightness dependant on the time of day
  • Next to vehicle parameter tracking, the device can also track the driver's performance
  • The Edge Insight CTS3 can monitor and display every piece of information in real-time


  • Not a tuner, just a monitoring device

What Other Cummins Owners are Saying

The Edge Insight CTS3 allows a peek into what your vehicle is doing. It's easy to use and install; you can customize the screen to match your style as well. The updates and patches are consistent without the need to connect to a PC. There aren't any unnecessary cables, resulting in a cleaner look. Next to monitoring, people also purchase the Edge Insight CTS3 to check and clear codes.

Why it Stands Out to Us

Widely praised as one of the best digital gauge monitors on the market, the Edge Insight CTS3 allows you to track every key vehicle parameter; EGT, regen cycles, boost, and many more! The gauges and backgrounds are customizable down to every detail.

Next to tracking vehicle parameters, you can also measure 0-60 time, mile time, and more driver-oriented details. Other than monitoring, you can also read and clear codes with the Insight CTS3. The device is compatible with backup cameras, but a new adaptor will be needed.

Bottom Line 

The Edge Insight CTS3 is a borderline necessary addition to every vehicle. With this device, you'll be able to track exactly what your truck is doing in real-time displayed on a clean and stylish monitor.

Best Budget 6.7 Cummins Tuner:
Smarty S67


  • A choice between 10 different power levels
  • Simple plug and play installation with the OBDII
  • Quick and simple updates with the built-in USB stick
  • Boost Fooler allows you to bypass the stock boost limit
  • The horsepower settings have a torque management feature


  • Smarty S67 only works with 2007.5 to the 2012 year trucks
  • You will need to be a bit careful with the 8th and 9th power levels, and may generate a little smoke

What Other Cummins Owners are Saying

The Smarty S-67 makes your truck run as it should. The instructions are easy to follow, and the user experience is simple and straightforward. Customers have noticed an incredible difference in power, even on the #1 level. Next to power, many also claim that the Smarty S-67 had a great impact on fuel economy.

Why it Stands Out to Us

The Smarty S-67 is an extraordinary high-performance diesel engine tuner for a great price! The horsepower settings transform your truck even at lower levels. The throttle response is quite noticeable, but in order to not destroy the drivetrain there is a safe limit. The tune was created on a completely stock truck with an increase of 170 horsepower at the 9th level option, Smarty claims. The tire height is adjustable up to 44", but the vehicle needs to be VIN locked beforehand. With the Smarty S-67, you're also able to read and clear codes.

Bottom Line

Smarty S-67 delivers incredible power improvements on a budget. It's a simple device that comes without any unnecessary features, focusing on performance only. You will also likely notice an improvement in mileage.


  • The Edge Evolution CTS2 comes with a diagnostic tool
  • The tuner allows for manual regeneration of your truck
  • Excellent monitor with a lot of options for customization
  • Saves factory settings and it can easily return your vehicle to stock
  • The performance testing feature lets the driver test and tweak the vehicle
  • The tuner has a maintenance manager that alerts the driver before maintenance is due


  • Coverage for 6.7 Cummins stopped in 2013
  • Edge Evolution CTS3 isn't compatible with manual transmissions for 2011

What Other Cummins Owners are Saying

The Edge Evolution CTS2 offers moderate power gains with five adjustable preset tunes. The presets do what they were designed to do very well, turning your truck into a jack of all trades. The tuner comes with a stylish monitor that can read every key parameter; Some customers have purchased the Edge Evolution CTS2 for the monitor exclusively.

Why it Stands Out to Us

The Edge Evolution CTS2 has five preset tunes: transmission only, economy, towing, performance, and extreme. These tunes are adjustable in a user-friendly way, and you have the option to return the truck to factory settings.

The monitor display looks excellent, with many different customization options. The gauges can be set to track key vehicle parameters, so the tuner itself can be used as a monitor only. The performance testing feature lets the driver test and measure different options that can be uploaded to a PC for a review. The tuner has diagnostic capabilities that lets the driver read and clear codes.

Bottom Line

Excellent multi-purpose tuner for any 2003-12 6.7L Cummins. The Edge Evolution CTS2 can unlock a great amount of power from a Cummins, making your truck fun to drive. The monitor stands out from the rest with its stylish look, customization possibilities, and key parameter tracking.

While this is a decent option for someone who NEEDS a monitoring device, but their budget limits them from picking up a Smarty along with a separate monitor. We don't recommend running the extreme tune on Cummins vehicles.

Types of Tuners for the 6.7 Cummins

Let's recap the types of tuners on the market today and where these fall:

"Canned" Tuners

Canned tuners are developed for stock engines exclusively; they do not account for additional modifications, and they cannot utilize their potential. They are developed for stock vehicles, or vehicles with very minor modifications.

Canned tuners most often come with a few different tunes designed for a specific purpose. Since they are mass-produced, they are more budget-friendly than tuners with custom tunes. Canned tuners do offer a good amount of power, but since they aren't customized to your specific vehicle, they cannot unlock every drop of power possible. Perfect for stock engines, but less useful for modified trucks.

The tuners we reviewed that fall under this category are the Smarty Touch, the Edge Evolution CTS2, and the Smarty S67.

"Canned" Tuners With Custom Tune Abilities

"Canned" tuners with custom tune abilities come with preset tunes from the manufacturer, but they offer the option to purchase custom-made tunes from an outside party. However, custom tunes can also be purchased from a 3rd party technician capable of uploading his/her tunes to the device.

These tuners are versatile since you have the option of flashing the preset tunes onto a vehicle or purchasing custom made tunes and getting the most out of your truck. The preset tunes are perfect for stock vehicles, and if you plan on modifying your truck in the future, custom tunes will account for each modification, in turn offering more potential for performance improvements.

Custom Tuning Modules

Custom tuning modules can squeeze every drop of power from your truck since they account for every modification you've made. The modules generally come without a tune from the manufacturer, so you will need to purchase a custom made tune from an outside party. That is, unless the tuning is already included, as it is with our MM3 above.

The MM3 Tuner reviewed here is one example of a custom tuner. Another example would be the EZLynk Tuner (not reviewed here).

Common Tuner Issues

Here's a few common problems some users run into during install or after a few years of use:

Updating The Tuner

Some tuners come with automatic software updates through a Wi-Fi connection, while other tuners do not have that feature. Instead, it's advised to check for a new update every couple of months. To update the tuner, download the software update for your vehicle from the manufacturer's website, connect the tuner to your PC with the included USB cable, and the installation from there should be simple and straightforward. The update shouldn't take much time, but that depends on the manufacturer and the tuner itself.

Frozen Installation

There are a couple of reasons because of which the tuner can freeze during installation. The most common being aftermarket electronics and devices connected to the vehicle. Simply unplug any aftermarket devices and redo the installation process.

Another reason for frozen installation would be battery power. Before flashing a tune, having a healthy battery is crucial. Charging the battery can also make the installation freeze. Disconnect the charger and restart the installation process.

The Tuner Won't Power On

Tuner failure to power on is usually caused by faulty wiring or flimsy cable connection. Disconnect everything from the vehicle and put it back together carefully, ensuring that the cables are inspected and firmly connected.


Cummins being an engine with a great amount of potential deserves the best. These tuners will unlock that potential for you, making you wish you've purchased the tuners sooner! Pick the tuner that works best for your application, flash a tune, and reach new limits with your unleashed Cummins.

People Also Ask

Tuning vehicles is no longer complicated. Manufacturers have come a long way, making tuners that are simple to install and use. However, there are still many misconceptions and unanswered questions about tuners. We've answered the most common questions people ask, and if you have any more questions, please contact us for more information.

Can I Get an H&S Tuner For My 6.7 Cummins?

To a massive disappointment in the diesel tuning community, H&S went out of business due to EPA laws and regulations. Due to deletes, H&S was fined a huge sum of money by the EPA, which forced them to shut down, no longer manufacturing tuners.

Can I Do a 6.7 Cummins EGR Delete Without a Tuner?

EGR delete without a tuner isn't possible. Doing so without a tuner will quite likely make the truck malfunction. With very old trucks, you were able to unplug the EGR without any issues. However, on newer trucks, it's best to do the EGR delete with a tuner.

What's A Good DPF Delete Tuner For 6.7 Cummins?

There aren't tuners that come from the manufacturer with the ability to delete the DPF. However, tuners that can load custom tunes allow you to do the DPF delete, but you will have to find a tuning shop open to writing the tune.