A modification package exists for the 2018 GMC Terrain diesel model that enables the removal of components related to the vehicle’s emissions control system. This typically involves physically removing parts such as the diesel particulate filter (DPF), the exhaust gas recirculation (EGR) system, and associated sensors. Software modifications are then implemented to recalibrate the engine control unit (ECU) to operate without these systems present.
The implementation of such a system can result in increased horsepower and torque, potentially leading to improved fuel economy. It is primarily implemented because it reduces the potential for costly repairs associated with emissions control devices, which are prone to failure over time. The historical context is rooted in the desire to circumvent emission regulations and improve vehicle performance, a practice that has faced increasing scrutiny from environmental protection agencies.