The assembly in question is a collection of aftermarket components designed to remove or bypass elements of the emissions control system in a specific model year and configuration of a heavy-duty pickup truck. This typically involves removing the diesel particulate filter (DPF), the exhaust gas recirculation (EGR) system, and/or the selective catalytic reduction (SCR) system. Such kits are intended to alter the vehicle’s original factory configuration.
Reasons for considering this modification often revolve around potential improvements in fuel economy, increased engine performance, and reduced maintenance costs associated with the factory emissions control systems. Historically, some owners have reported issues with the reliability and longevity of these systems, leading them to explore alternatives. However, it is critical to understand the potential legal and environmental consequences of altering or removing these federally mandated emission control devices.