Should You Upgrade Your 6.7lL Cummins Engine?

The 6.7L Cummins engine can be described as a beast. For the RAM 2500 and 3500 pickup trucks, it is the most powerful engine option. The powerhouse engine helps RAM trucks tow almost anything and provides excellent fuel economy and durability. The engine sounds like one of the perfect engines in the market, producing 1,000 pound-feet of clean diesel torque and up to 400 horsepower. The RAM 3500 was the first truck in its category to achieve more than 1000 lb-ft torque.

The engine goes further to guarantee power and reliability and a fantastic 15,000-thousand-mile oil change intervals. However, there is always room for improvement, and investing in the best performance modifications will make your 6.7L Cummins engine perform even better and have a longer life span. Upgrading your 6.7L Cummins engine is a definite yes.

About the  6.7lL Cummins Engine

N14, formerly known as the 6.7lL Cummins Turbo Diesel engine, is a six-cylinder diesel engine that was designed for medium-duty commercial trucks and is currently used in various RAM pickups including the 3500 dually. It has an astonishing amount of horsepower at 3000 rpm and 400 pound-feet of torque at 1600 rpm. The maximum number of horsepower and torque levels can go as high as 730 and 1070, respectively.

The engine uses Bosch VP44 electronic high-pressure common rail fuel injection technology with a displacement of 381 cubic inches (6.7 liters). The maximum number of horsepower and torque levels can go as high as 730 and 1070, respectively. It also features an intercooler water spray system that is similar to the one used in the bigger engines like 855 A/T and Maxxforce 13 DT. This makes it highly compatible with many heavy-duty differentials, transmissions, drive axles, and other components from previous Cummins engines.

However, the N14 is not completely new for Cummins since it has been upgraded several times and has the same base as the older Cummins ISB engine. The Ram 1500, for example, uses two types of Cummins engines; one is a completely redesigned unit while the other is an upgraded version of the previous model.

The 6.7lL Cummins Engine Upgrade

By upgrading your old Cummins engine with new components like turbochargers, exhaust manifolds, and injectors, you can increase both performance and fuel economy at the same time. A newer model engine will increase horsepower by 30 percent or more depending on how it is customized.

Upgrading to larger after-market turbochargers produces more power than OEM units because they have enough space for larger compressors which produce higher pressure ratios even at high rpm ranges. Larger turbochargers also allow more air to flow into the engine which means it can produce more power without significantly increasing fuel consumption.

In addition, an upgraded exhaust manifold allows for higher operating temperature ranges due to less heat loss from the muffler and a larger cross-sectional area. Having a larger cross-sectional area reduces back pressure and increases horsepower by around 10 percent depending on the specific manifold design used.

Creating an Even Better Beast for 6.7L Cummins Engine (6.7L Cummins Upgrades)

No one can deny the urge to modify their trucks to their desired expectations or admirations, and this article is all about the best 6.7L Cummins engine upgrades that will turn your engine into a total beast, learn more here at

DPF Filter

Upgrade your Cummins with aftermarket high-performance stainless steel Bosch NOx reducing diesel particulate filters (DPFs). A new DPF will improve both performance and fuel economy at the same time by about 5 percent. For best results, purchase custom-made DPFs that are designed for use in bigger engines like those found in heavy-duty trucks and SUVs.

Fuel System

Upgrade your Cummins engine with a high-performance fuel system. The stock 6.7L Cummins comes with Bosch P7100 injection pumps that use solenoids to control the flow of diesel fuel into the cylinders. A newer model pump such as the Bosch VE injection pump will last longer because it uses piezo technology for better precision control and less stress on components, resulting in fewer malfunctions and repairs compared to older models.

Build a completely new or upgraded exhaust system using stainless steel pipes and mufflers from companies like Banks Power, Fabtech, MBRP Inc., S&B Filters, and Volant Performance Exhausts for best results. They often install larger turbochargers

Cold Air Intake Upgrade

Upgrading your cold air intake system will help you significantly save on fuel. The cold air intake provides your diesel engine with cooler and denser air since the original designs are restrictive and limit the amount of air being drawn in. High-quality aftermarket air intakes help increase airflow over stock, extending your motor’s life by keeping your engine cool and keeping your pockets safe in terms of fuel economy.

Lift Pumps Upgrade

Lift pumps ensure your 6.7L Cummins engine gets sufficient fuel and offer better filtration than your fuel filter, hence efficient power production and engine performance. The high-pressure Cummins fuel pump system is prone to failure when forced to run on bad fuel for long, creating the need for a lift pump that ensures your motor gets all the fuel it needs.


If you want to keep your motor cooler and increase its lifespan, despite the 6.7L Cummins engine getting hotter due to its size, providing your engine with an aftermarket intercooler will do the job of ensuring a constant supply of colder air and a fantastic performance.

Head studs

Aftermarket head studs are significant for any single or twin turbochargers since they experience incredibly high internal cylinder pressures high in heavy-duty trucks.


The Cummins engine has a central weak point in its transmission, and changing the sump pan can come in handy. The sump pan is designed to increase fluid capacity and lower its temperature, ensuring extended transmission working life and making maintenance easier.

Other upgrades that will be beneficial to your truck include tuning, which should be done by a specialist and will guarantee increased efficiency and performance. Modifying the exhaust will help reduce back pressure after the diesel particulate filter (DPF) and make your engine roar.


Precaution must be taken when handling new Cummins since one must know which mods affect your truck’s factory warranty.  The warranty primarily covers the first three years or 36,000 miles. There are still many modifications one can undertake as long as it is in line with your vehicle’s manual and with the help of the dealership and a brilliant mechanic. Altering the speedometer and adding a device that changes the speedometer are actions that void your truck warranty.

Other benefits of upgrading your 6.7L Cummins engine include a longer life span and lower fuel consumption among others, but always invest in high-quality products that guarantee you work well with your truck to avoid failures.


Upgrading your 6.7L Cummins engine is a yes as long as you take precautions, use specialists, and follow your truck manual.  Also, always take care of your truck and do regular maintenance to avoid frequent breakdowns.