Frequently Asked Questions

Module Questions

Using stand-alone plug and play technology we are able to improve performance without reprogramming your vehicle’s computer. There is no downloading, splicing wires, or modifications to get in your way. The module is placed under the hood of the vehicle with no additional modifications or monitoring necessary. Performance gains include: more turbo boost in less time, optimal fuel pressure when you need it, increased torque and horsepower, and most importantly a new power curve that compliments daily driving situations.

The majority of modules do not even require tools for installation. Depending on your application, you may need to remove a cover or intake tube. There are detailed instructions available for your review under the Installation tab on our website.

We offer 24/7 technical support via phone at (888) 613-4304

It depends on what you’re after! A flash tuner is geared towards top end power, whereas the Stealth Module works at your low to mid range RPMs. This is where 99% of your driving occurs. The Module is a non-invasive device that requires no flashing of your ECM or other modification. It is a safe way to get better performance out of your Cummins, Powerstroke, Duramax, Nissan Titan or Land Rover without sacrificing your warranty.

The Stealth Module does not flash or reprogram your vehicle’s computer. We are able to give you the extra performance you want out of your truck while working within the factory safety parameters. In fact, the Module was designed to work on a completely stock truck.

Yes! It works great on deleted trucks too. Just because these burn clean enough to work with your emissions intact does not mean you can't continue to run it after the emissions are removed. If you're looking to pair it with power tunes please reference the next question.


Since these modules are selectable, you have the option of switching between the safe and efficient power of our module or turning ours down to crank up your other power tunes for all out high end power.

These control the fuel delivery by intercepting signals after the truck's computer. Some applications bring the rail pressure up to where it should be much sooner while others use pulse width manipulation. By delivering the fuel more efficiently in the RPM range that you drive in everyday, it enables you to keep your RPMs down, hold gears better, and use less throttle to get down the road.

On average we see anywhere from 30-90 hp to the wheels and up to 120ft lbs of torque on a dyno. The thing is, these modules aren't made for dyno figures or racing. These are to provide functional low to midrange power in the RPM range you use for daily driving and/or towing situations. Keep in mind that a Dyno measures power at wide open throttle. It can't measure daily driving improvements like rolling into the throttle and holding gears better. These are designed for the 99% of driving situations where your foot is not to the floor.

It really depends on the specific truck, conditions, and driving style. Try each setting for a week to see what works best for you. Medium is a great all around setting that most people prefer.

Stealth Performance Products is a small team with a passion for customer service and the automotive industry. We strive every day to show that our main priority IS our customers. You support us, we support you right back. The development of all our products is done in house. This gives us an upper hand in understanding the product and making sure it does what it’s supposed to. 

We take pride in the fact that we have been making it possible for diesel pickup owners to keep the factory emission settings on their trucks when using our safe, clean, easy, and reliable device. Our A+ BBB rating and positive reviews are evidence that we are successfully leading the diesel performance industry in the right direction. 

Something else to ponder..  If I needed answers about a product that was on my daily driver after “business” hours, or on the weekend, I’d want the ability to talk to someone. Try us; we are available by phone 24/7.

It will not cause harm to the truck if settings are changed on the fly but it is recommended that the settings are changed while the truck is off. Ideally, it should be left in one setting for as long as possible in order for it to adapt.

Yes! The Stealth Modules were designed to work on a completely stock truck. We take pride in the fact that we have been making it possible for diesel pickup owners to keep the factory emission settings on their trucks when using our safe, clean, easy, and reliable device.

Yes, tow/haul mode directly controls your transmission and how it shifts for optimal towing performance and longevity of the transmission.

Yes. The Stealth Module brings the power in much earlier and smoother. This helps transform the power curve into more of a 4 stroke power curve compared to a 2 stroke where there is a lot of lag followed by a sudden surge in power. This will help the transmission hold gears much better and not have to jump around searching for power.


Yes. These work great if you are empty. It can sometimes be even more noticeable, especially when it comes to mileage because there is no weight behind you to absorb the added power.

These are going to be two completely different devices with different purposes. Throttle manipulators are strictly to adjust how aggressive your physical throttle input is seen to the engine. Example: When you physically put in 25% throttle manually with your foot, the engine will see above that which gives a vehicle more of a sporty feel. However, there is zero change in engine output.

Our module is designed to give you more low-mid RPM range power where you need it for pulling and driving situations. We do not manipulate throttle aggressiveness. Both devices can be run together if you would like more power along with a more sporty feeling in the vehicle.

There can be a slight delay between settings. The big thing is letting the transmission adapt. It's best to leave it alone as much as possible.

There is no reason to wait a certain amount of miles. These trucks are run adaptive so it's best to have the transmission learn it's shifting habits with the Stealth Module.

The Stealth Performance Modules are not CARB exempt at this time and are not legal for sale in California or use on vehicles registered with the California Department of Motor Vehicles.

No. These are very safe and do not use aggressive timing. Since these do not override your stock safety parameters, your truck's original programming monitors and protects your truck like it was designed to from the factory. You can run it on a completely stock truck with no issues.

The type of performance gains achieved with the module are absolutely noticeable, but relatively mild.  We are not piling on peak horsepower. The gains are on the low end and typically tend to flatten the power curve.  Making the added power very smooth and predictable.  It is a safe and noninvasive approach to achieving better performance.

The majority of the Stealth Modules are installed in 20 minutes on average with little to no tools. In a majority of applications, the module plugs inline with the fuel pressure sensor with some plugging inline to the boost sensor as well. Specific installation procedures vary depending on application but can typically be installed yourself with minimal mechanical knowledge. We have all of our installation instructions located here. Feel free to give us a call at (888) 613-4304 if you have any questions during the installation process! We offer 24/7 technical support.

The module does work with a tuner for the majority of applications. The module helps bring the power in earlier and smoother if running power tunes.

The only module that will not work on top of a power tune is the 13-18 Cummins 6.7L Module. This particular unit has a different approach than the others. 

If you have any other questions regarding your particular set up in conjunction with use of a Stealth module, please give us a call 888-613-4304.

The switch works going clockwise: Stock, Low, medium, and High.

Starting all the way to the left or counterclockwise: Stock (module is not doing anything/pass through), 1 click: to the right or clockwise: Low, 2 clicks: Medium, and 3 clicks: High.

The numbers do not mean anything on the current dial, it goes by number of clicks as it is turned.

There are installation instructions on our website and videos for most applications found here: 

Installation Instructions 

You are also welcome to give our 24/7 technical support a call for any assistance at (888) 613-4304

We have options available by request. You are welcome to call us or complete a customer support form here:

Customer Support Form


Yes, the modules work with emissions intact.

Yes the product will work on the majority of applications that are already tuned and deleted. The module does not handle or enable deletes. This is because a tuner is needed to go in and flash the truck’s computer to handle the modification(s).


Shipping varies. If you're in the United States any order over $100 includes free shipping!

Standard shipping takes 5 - 7 business days.

Expedited shipping takes 1 business day.

Note: Any orders made after 12:00pm EST may be processed the next business day.

Saturdays, Sundays, and Federal Holidays are not considered business days.

If you place an order on a Friday before 12:00pm EST and select expedited shipping, it will ship out Friday and arrive Monday. If you place an order on a Friday AFTER 12:00pm EST and select expedited shipping, it will not ship until Monday and will arrive Tuesday.

No, there are way too many factors.  What we can tell you is that we do not make any changes to your truck's computer so there is no history left behind (no footprint).  It is the customer's responsibility to remove before service so that the module is not physically seen.

The product has a Limited Lifetime warranty.  The product has a Limited 1 year Warranty, with an optional Limited Lifetime warranty (+$100)  If the product is presumed faulty, please contact us for support.  Call 1-888-613-4304.  Warranty excludes and disclaims any liability or obligation for incidental or consequential damages and cost related to such damages including but not limited to installation, removal or repair labor, rental vehicles, tow or any other inconvenience costs. Such costs will be the responsibility of the vehicle owner.

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It is the customer's responsibility to understand the guidelines of their specific warranty. The module will not leave a footprint behind in the truck’s computer. It is the customer’s responsibility to remove before service so that it is not physically seen.

We accept Visa, Mastercard, Discover, American Express, JCB, Diners Club, PayPal, Amazon Pay, Apple Pay, Shopify Pay via the online store.

We offer financing via Affirm. Click Affirm at checkout to find out more.

Payment options through Affirm are subject to an eligibility check and are provided by these lending

There are many factors that play a role in fuel economy, it's impossible to guarantee fuel economy gains. However, you are welcome to contact us anytime to discuss options.

If the product is not performing there may be something wrong with the unit in which case we would troubleshoot and determine whether an exchange is necessary. If an exchange is not necessary you are able to return the product, once approved, within 30 days of purchase.

Refunds are limited to modules that were purchased within 30 days directly from Stealth Performance Products. All returns within this period are subject to a 20% restocking fee.

If circumstances allow, that a unit is returned over a 30 day period, the return is subject to a 25% fee. No returns will be permitted after 90 days.

If you don't notice a power difference, the unit is likely not working properly. The main indicator we use to determine if the module is working correctly is feeling the power difference. We would troubleshoot and determine how to move forward. If an exchange is not necessary you are able to return the product, once approved, within 30 days of purchase. However, it is subject to a 20% restocking fee.

If you are not satisfied or have issues with our product, we are here to help. Please read below to ensure the policy in place is fully understood. Feel free to contact us with additional questions or concerns.

Refunds are limited to modules that were purchased within 30 days directly from Stealth Performance Products. All returns within this period are subject to a 20% restocking fee.

If circumstances allow a unit to be returned after the 30 day period, the return is subject to a 25% fee. No returns will be permitted after 90 days.

All warranty is limited to the repair and/or exchange of the original product. Our modules can be exchanged in the case of manufacturer defects with proof of the original purchase of the product. See below Warranty section for additional information.

Apparel is a final sale and cannot be returned or exchanged.

Please contact us before you send the product:

By email: Customer Support

We can issue you a return label at our cost for tracking purposes as needed.

You must include the order # along with an explanation of why you are returning it. We cannot be held liable for packages that are damaged or stolen. We recommend you keep your receipt / take a picture of the receipt with tracking information and forward it to us.

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We offer a number of replacement parts, however if it's not listed on the site please contact us so we can work with you to get you a replacement as needed.