Have you ever started your car and noticed a weird sound coming from the engine? Maybe it’s a rattling noise, a squeaking belt, or a knocking sound that just doesn’t seem right. Whatever it is,it can make you nervous that something serious might be going on under the hood. The good news is before you rush to the mechanic, there are a few things you can check yourself. One of the easiest ways to diagnose engine noises is with a def delete kit. If you’re not familiar with def delete kits, don’t worry, we’ve got you covered. This ultimate guide will teach you everything you need to know about using a def delete kit to figure out the source of those mysterious engine noises and determine if it’s something you can fix yourself or if it’s best left to the professionals.
What Is a Def Delete Kit?
A def delete kit is designed to remove built-up carbon and gunk from your vehicle’s engine and exhaust system.
What’s Included
A basic kit typically contains:
- Def fluid (also called diesel exhaust fluid or urea solution)
- An injector to spray the fluid
- Hoses, connectors and clips
- Instructions for how to use the kit properly
The def delete kit works by spraying a fine mist of def fluid into your vehicle’s exhaust stream, which helps break down harmful nitrogen oxide emissions into nitrogen and water vapor before they leave the tailpipe. By removing the def system and using a def delete kit instead, you may experience improved engine performance and fuel economy.
However, deleting your vehicle’s def system is illegal for on-road use in many areas since it tampers with required emissions controls. Check your local laws before installing a def delete kit. If legal in your area, the kit should take around 30-60 minutes to install for someone with basic mechanical skills.
Be very careful when installing the kit since you’ll be working around hot exhaust components. Always let your vehicle cool for at least 2 hours before starting to avoid burns. With the proper precautions taken though, a def delete kit can be an affordable option for improving your diesel’s performance.
How to Use a Def Delete Kit Properly
To get the most out of your def delete kit, follow these steps:
Prep the Area
Make sure you have good ventilation and are in a well-lit spot. Clear the area of any valuables or electronics that could get damaged. Lay down protective sheeting like plastic or tarp on the floor and any nearby furniture.
Mix the Chemicals
Carefully combine the def delete powder and activator liquid in the tray provided, following the instructions on the product. Gently stir until it reaches a paste-like consistency. Be very careful not to get any of the chemicals on your skin – wear the gloves and goggles provided.
Apply the Paste
Use the putty knife to spread an even layer of the paste over the area you want to delete, about 1/4 inch thick. Make sure you cover the entire area. Let the paste sit for the recommended time, usually around 3 to 5 minutes.
Wipe Clean
Once time is up, use the abrasive side of the sponge to scrub off the paste. Wipe away any remaining residue with water and the non-abrasive side of the sponge. Rinse the area with water and pat dry with a clean cloth.
Ventilate and Protect
Keep the area well-ventilated as the chemicals release fumes. Avoid the area for at least 24 hours. For the next week, cover the area when going outside to protect new sensitive skin. Moisturize daily to keep skin hydrated.
With the proper technique and safety precautions, a def delete kit can be very effective. But be extremely careful, follow all instructions, and never overuse – your skin will thank you!

Top Def Delete Kits to Consider Buying
Once you’ve decided to delete the DPF and EGR systems in your diesel vehicle, you’ll need to choose a quality def delete kit to properly complete the job. Here are some of the top kits to consider:
Sinister Diesel Delete Kit
Sinister Diesel is a reputable brand known for high-quality, durable def delete kits. Their kit includes everything needed to remove your DPF, EGR valve, and catalytic converter. It comes with stainless steel up pipes, downpipes, and exhaust tubing to replace the factory parts. The kit is available for most popular diesel trucks like the Ford Powerstroke, Chevy Duramax, and Dodge Cummins.
MM3 Tuner Def Delete Kit
MM3 Tuner offers an affordable, full def delete kit for DIY install. In addition to the hardware (up pipes, downpipes, etc.), their kit includes an MM3 tuner device to disable the DPF and EGR systems in your ECU. They offer kits for Ford, Chevy/GMC, and Dodge diesel trucks. The MM3 tuner allows you to choose from multiple tunes to improve power and performance.
Strictly Diesel Def Delete Kit
Strictly Diesel is another reputable brand that produces high-quality, emissions delete kits. Their def delete kit includes everything needed to remove the DPF, EGR, and catalytic converter on your truck. It comes with stainless steel up pipes, downpipes, mufflers, and exhaust tubing. The kit also includes a tuner device to disable the emissions systems in the ECU. Strictly Diesel makes kits for most Ford, Chevy/GMC, and Dodge diesel pickups.
Choosing a def delete kit from a trusted brand will ensure you have all the necessary parts to properly and safely delete the emissions equipment on your diesel vehicle. Be sure to check if the kit includes a tuner to disable the DPF and EGR, as this is required for a full def delete. With the right kit and some mechanical skills, you can remove the excess emissions parts from your truck and open up its true performance potential.
Conclusion
So there you have it, everything you need to know about using a def delete kit to clean up your diesel engine. By now, you should feel confident in tackling this maintenance yourself and saving some money in the process. Just remember to take your time, follow the instructions carefully, and be safe. Diesel engines can require a bit more elbow grease to work on, but the results will be well worth it. Your engine will be running cleaner and more efficiently in no time. And the next time your diesel starts acting up or loses power, you’ll know exactly where to start – by pulling out your trusty def delete kit and getting to work. Stay tuned for more DIY guides to keep your diesel engine humming!