Emissions systems on trucks are designed to reduce and control the amount of harmful pollutants released into the atmosphere. These emissions systems are crucial in reducing the impact of trucking on the environment and improving air quality.

One of the major components of emissions systems on trucks is the exhaust gas recirculation (EGR) system. This system recirculates a portion of the engine's exhaust back into the intake system, which helps to reduce the amount of nitrogen oxide that is produced during combustion. Nitrogen oxide is a dangerous pollutant that contributes to the formation of smog and acid rain, so reducing its production is essential in meeting emissions regulations.

Another important emission system on trucks is the diesel particulate filter (DPF). This system captures and removes soot and other fine particulate matter that is emitted from the engine's exhaust. These particles can be harmful to both human health and the environment, so removing them from the exhaust is crucial in reducing the negative impact of trucking on the environment.

Selective catalytic reduction (SCR) systems are also commonly used in emissions systems on trucks. This technology uses a urea-based fluid to convert nitrogen oxide into harmless nitrogen and water vapor. This technology has proved to be highly effective in reducing harmful emissions and is estimated to reduce diesel emissions by up to 90%.


One of the primary reasons for DPF deletion is to increase fuel efficiency. While the DPF does an excellent job of trapping particulate matter and reducing emissions, it also restricts the flow of hot exhaust gases. This can lead to decreased fuel economy, which can have a significant impact on trucking operations' bottom line. By removing the DPF, trucks can achieve better fuel efficiency, particularly in applications where long distances are involved.

The DPF is also a potential source of reliability issues. Trucks that operate in applications that require frequent idling or stop-and-go traffic can experience DPF issues, resulting in significant downtime and repair costs. DPF regen cycles can also lead to increased wear and tear on the engine and injectors, which can ultimately lead to significant engine damage if not routinely checked.

Another reason for DPF deletion is to reduce maintenance costs. While DPFs are designed to provide many years of trouble-free operation, they can fail or become clogged. DPF replacement can be costly and time-consuming and may result in extended downtime for the truck. In situations where regular maintenance is difficult or trucks are put through particularly rigorous applications, DPF deletion can save trucking companies' time and money.

While DPF deletion can offer some benefits to trucking operations, it is important to note that doing so will result in a significant increase in harmful emissions. The Environmental Protection Agency (EPA) has enacted strict guidelines for diesel engines, and removal of the DPF will put trucking companies in violation of these guidelines. Additionally, tampering with emissions systems can result in significant fines and legal issues.