GM introduced the LMM Duramax engine in 2007 for the Chevy/GMC pickup truck models of 2007, 2008, 2009, and 2010. As stricter emission laws are enforced, manufacturers are forced to comply by installing emission components and systems. However, in practice, these systems have caused problems for the diesel truck industry. While these systems may work fine when the trucks are new, after 30-40k miles, they can become problematic. This DPF (diesel particulate filter) delete guide will explain the DPF system in detail and why removing it can be one of the best decisions you make for your LMM Duramax.

Emissions System Components

The 07-10 LMM Duramax consists of several emission system components, starting at the back of the turbocharger with a short section of downpipe. Attached to the downpipe is the DOC (diesel oxidation catalyst), followed by the DPF, and then the muffler and tailpipe section. Fortunately, both the muffler and DPF can be removed with a DPF delete kit.

Understanding the DPF

DPF stands for diesel particulate filter, and its purpose is to catch small unburnt particles within its filter. These particulates are then burnt off when the truck enters its regeneration cycle. Regen is the process of heating up the DPF in an attempt to burn this particulate matter. Unfortunately, over time, this process becomes less and less effective, causing the DPF to become plugged up. When the regen process can no longer burn out this material, it becomes plugged up and restricted, resulting in reduced fuel mileage, increased back pressure, reduced horsepower and torque, and poor drivability.

Advantages and Benefits of DPF Delete for LMM Duramax Trucks

LMM Duramax trucks are known for their durability and longevity, and deleting the DPF can enhance these qualities. With regular maintenance, the engine can last up to 500k miles. Removing the DPF restriction alone can increase horsepower by 20-30hp, and additional power gains can be achieved with DPF delete tuning. Deleting the DPF also eliminates turbo issues from excessive back pressure, and avoids costly repair bills and long back-orders for emission system components. Fuel mileage gains, lower EGT’s while towing, and longer turbo life due to lower back pressure in the exhaust are other benefits of DPF delete.

Downsides and Disadvantages of DPF Delete for LMM Duramax Trucks

While DPF delete can be the best thing for your truck, it comes with potential downsides to consider. Most shops will not install a DPF delete kit due to liability issues. This means that you will need to install it yourself or find a shop willing to do the work for cash with no receipt. If you decide to trade in your truck, dealerships may not accept a vehicle without OEM components, which can reduce its resale value. If you live in a jurisdiction that requires emissions testing, you may need to reinstall the OEM components before performing the test. Additionally, while all DPF delete capable tuners sold will not set a check engine light, some jurisdictions may look for a check engine light as part of their emissions testing.

Will a DPF Delete Void my Warranty on an LMM Duramax?

It is possible that a DPF delete on your LMM Duramax could void your warranty, but it may depend on the dealership you go to. Some service departments may refuse to work on your vehicle if they know the DPF has been deleted, while others may overlook it because they want the warranty work. Keep in mind that many issues with the LMM Duramax are related to the emissions system, which is eliminated by a complete delete. However, if your truck is still under warranty, it’s important to consider the potential consequences before deciding to delete the DPF.

What Does a DPF Delete Kit Remove on an LMM Duramax?

A complete DPF delete for your LMM Duramax will remove the CAT, DPF, and EGR. This is often done to improve the longevity and reliability of the engine, as well as to eliminate issues related to the emissions system. 

How to delete DPF on your LMM Duramax?

Installing a DPF delete kit and tuner on your LMM Duramax can be done with basic hand tools and a few hours of time. Using an automotive style lift can cut the time in half. All of the DPF delete kits we sell include everything you need for a complete installation, so no special trips to the hardware store are necessary. YouTube also has plenty of resources with step-by-step instructions for your specific vehicle.

Is Deleting Your DPF Worth It? 

We think it’s the best decision you can make for your truck. In fact, it should be the first modification you do when you drive it off the showroom floor. With the best DPF delete kit, you can boost fuel mileage and performance, making it a smart investment.

DPF Delete on LMM Duramax Trucks – Fuel Economy Improvements

One of the primary advantages of doing a DPF delete on your LMM Duramax truck is the fuel mileage gains. Depending on the condition of your existing DPF, you can expect to see a significant improvement in fuel efficiency. Typically, most drivers experience an increase in fuel economy from an average of 13-14 mpg to 18-20 mpg after deleting the DPF. However, tire size and driving habits can also impact the final mileage results.

Calculating the Return on Investment (ROI) for a DPF Delete

To better understand the potential benefits of a DPF delete, let’s look at a hypothetical example. Assuming that you currently spend around $5 per gallon of fuel, and you achieve a fuel efficiency improvement of 5 mpg after deleting the DPF, you would save around $41 every time you fill up a 30-gallon tank. This means that after driving around 540 miles, you could expect to save approximately $41 in fuel costs. After driving 15,000 miles, you could expect to save roughly $1,148 in fuel expenses.

If you want to remove the DPF on your LMM Duramax, you will need specific parts to ensure successful and efficient deletion.

DPF Delete Capable Tuner and DPF Delete Pipe

At a minimum, you will need a DPF delete capable tuner and DPF delete pipe. The DPF delete pipe can range from $300 to $400. A complete exhaust system will cost $500 to $1,000, depending on whether you choose aluminized or stainless steel. The DPF delete capable tuner will cost you $800 to $1,500.

Total Cost

If you decide to go with the complete setup, the cost will range from $1,200 to $2,500 depending on which direction you take. However, it’s important to note that deleting the DPF on your LMM Duramax may cause a check engine light to appear. It’s best to choose a high-quality DPF delete kit to avoid potential issues in the future.

Top DPF Delete Tuners, EGR Delete Kits, and DPF & CAT Delete Pipes for the LMM Duramax

If you’re considering deleting the DPF on your LMM Duramax, it’s essential to have a DPF delete tuner to ensure everything runs smoothly. The best DPF delete tuner for your truck will depend on your specific needs. Our top picks include the EFI Live AutoCal for additional aftermarket modifications, the H&S Mini Maxx for monitoring your truck’s parameters while driving, and the EZ Lynk Auto Agent if you prefer using your phone or tablet to change power levels and view gauges.

When it comes to the best EGR delete kit, we found a source in the US that manufactures high-quality, made in America parts. Other EGR delete kits on the market are typically made in China, resulting in poor fitment and craftsmanship.

For the best DPF & CAT delete pipe for your LMM Duramax, we recommend our stainless T-409 kit. Many other companies offer poorly made, made in China junk that doesn’t fit correctly. Our DPF & CAT delete pipe is made in the US and provides excellent fitment and durability.

Deleting the DPF on your LMM Duramax requires a DPF delete capable tune to prevent issues like a check engine light or limp home mode. Installing a DPF delete exhaust and a CAT delete pipe will also improve your truck’s performance. Contact us today to learn more about the best DPF delete kit for your truck.

To sum it up

To conclude, our stance is clear. If you want to keep your LMM Duramax for the long haul, installing a DPF delete kit is the best decision you can make. If you have read this far and have decided to go down that path, call to us for special proposal.