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Frequently Asked Questions

Before submitting a request, please read over our frequently asked questions page.

Module Questions

What is a Stealth Module?

The Stealth module is a stand alone computer used to improve the diesel truck’s engine performance. It is plug and play style technology. It does not flash the truck’s computer. There is no downloading, no splicing wires, and no modifications required to use this product. Performance gains include: less turbo lag across the whole RPM spectrum, better throttle response, added torque and low-end horsepower.

Do I need to remove any parts to put the module in?

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

What kind of support is available if I need help installing the module?

We offer 24/7 support via phone at 1-888-613-4304.  

Why should I go with the module over a power tune?

That depends on what you're after. The module is very non-invasive and safe. Better drivability all around. There are no endless modifications. Just plug and go.

The module is a safe way to get better performance from your newer diesel without spending a ton, without sacrificing warranty, without losing value from your truck.

Should I get the preset or selectable?

If your main concern is fuel economy gains, we recommend the preset because it is set in a good all-around setting and the upfront cost is lower so you can start paying yourself back faster with fuel savings!

The selectable is awesome, no doubt. There is satisfaction in being able to control the unit to your personal liking. It is great for towing too, in case you are towing real heavy, you may want to turn it to low. And, if you get the preset, you may always be wondering what that high setting is all about...

Do I need to buy gauges or have any other modifications?

Since we don't increase fuel volume like a typical tuner or programmer, there is no need for other modifications. The module was designed to work on a completely stock truck.

If I decide to delete my truck will this still work on my 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.

Will the Stealth Module work with all programmers?

Results vary depending on the specific truck.

All of our Powerstroke modules work great along with a delete and power tune.

Duramaxs modules work great on deleted trucks but tend to really see the most benefits when paired with stock or a lower power tune.

2003-2012 Cummins modules work great along with a delete and power tune.
2013-2019 Cummins works best along with a stock power delete tune.

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.

What exactly does the module do to increase power and increase chances of fuel efficiency?

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.

How much horsepower will I actually gain?

On average we see anywhere from 50-70 hp to the wheels and 100-145 ft 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. 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.

What is the best setting for fuel economy?

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.

Why would I choose this product over someone else's?

Stealth is a family operated business that is always available for our customers and we strive every day to show that our main priority IS our customers. You support us, we support you right back. The technology we use comes right from the original inventor. This obviously gives us an upper hand on understanding the product and making sure it does what it's supposed to do.

Something to ponder... I know if I needed answers with a product on my daily driver after "business" hours, or on a Sunday, I'd want the ability to talk to someone. Try us. We are available by phone 24/7.

Can the settings be changed on the fly or does the truck need to be off?

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.

Will the module work with emissions intact?

Yes, they were designed to work on a completely stock truck.

Do I still need to use my vehicles tow/haul mode with the module while towing?

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

Do the modules help with transmission shifting?

Yes. The Stealth Module brings the power in much earlier and smoother. This help 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.

How will a Stealth Module help me when towing a camper or RV?

This will help get rid of that dead pedal laggy feel, get you up to speed with less effort by providing more torque, and enable you to hold gears much better.

Have you seen a difference when you're not pulling anything?

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.

What is this difference between the Stealth Module and a throttle booster and can they be used together?

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 ran together if you would like more power along with a more sporty feeling in the vehicle.

Do you have to allow any learning time when switching between power levels?

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.

Is there a minimum amount of miles I should have on the motor before installing a Stealth Module?

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 our module.

Is this module allowed in California?

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

Should I be concerned with blowing a head gasket or causing any harm to my truck while using the Stealth Module?

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.

Will the Stealth Module damage my transmission or engine?

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.

How easy is it to install a Stealth Module?

Stealth Modules plug inline with the injection harness under the hood. Specific installation procedure varies depending on application but can typically be installed yourself with minimal mechanical knowledge. We have instructions with videos for selected modules on our Instructions page at https://www.stealthmodules.com/pages/instructions-and-info

Does the module work with ______ tuner?

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 13-19 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.

Does the module work with gas trucks?

We currently only offer solutions for diesel pickups. We do plan on releasing additional solutions for gas in the future so be sure to like our Facebook page so you can see the latest products coming out.

Which way do you turn the selector switch?

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.

How do I install the module?

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

Installation Instructions

Are there options for extensions wires or jumper plugs for certain applications?

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

Customer Support Form

Does the Cummins module work with the Aisen Transmission?


Does this product work with emissions equipment?

Yes, the modules work with emissions intact.

Does this product work with a tune and delete?

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).

Are these products VIN locked and can it be transferred to a different vehicle that shares the same make, model, and year range?

Our modules do not require you to unlock the factory computer. They are not VIN locked and can be transferred to another vehicle that it is applicable to.

Shipping Questions

How much is shipping?

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

Shipping in Alaska and Hawaii varies depending on your location and will be calculated automatically once an address is entered.

How long does shipping take?

Standard shipping takes 5 - 7 business days.

Expedited shipping takes 1 business day.

Ground shipping for Alaska and Hawaii might take a little longer.

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.

Warranty Questions

Is there a guarantee this will not void my warranty?

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.

What kind of warranty do you offer for the modules?

The product has a Limited Lifetime warranty. If the product is presumed faulty, please contact us for support and possible prompt exchange of the product. 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.

Read more: https://www.stealthmodules.com/pages/return-policy-warranty-info

Does this module void the factory warranty?

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.

Payment Questions

What payment methods do you accept?

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

Do you have a financing option?

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

Return or Exchange Policy Questions

What if I don't get better fuel economy?

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 I don't like it, can I have a refund?

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.

What if I don't notice a power difference?

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 whether and exchange is necessary. 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 15% restocking fee.

What is your refund policy?

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 to us.

Read more: https://www.stealthmodules.com/pages/return-policy-and-warranty-info

What if I damage the unit?

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.

What if I received a damaged product?

If you received a damaged product, please notify us immediately for assistance.

By email: Customer Support

I’m having problems with check engine light and idle after installing the module.

If you get a check engine light, hard start, or, a rough idle upon installation - there is a connection problem. Double check all connections. You can contact our 24/7 tech support via phone at (888) 613-4304 to assist you.

General Questions

Return or Exchange Policy Questions

What kind of snake oil is this?

The module WORKS. The technology is PROVEN. There are millions of dollars invested in research and development by the original innovator of this type of technology. However, we are taking one program and applying it to thousands of trucks which are all in different conditions, with different drivers, in different locations… You may not see the same results as others.