A modification package designed for Volkswagen Jetta TDI (Turbocharged Direct Injection) vehicles involves the removal of certain emission control components. This often includes the diesel particulate filter (DPF), the exhaust gas recirculation (EGR) system, and sometimes the catalytic converter. These components are originally installed to reduce harmful emissions, but their removal is often pursued for performance enhancements or maintenance simplification.
The primary justifications for undertaking this modification relate to potential improvements in fuel economy, increased engine horsepower, and the elimination of recurring maintenance issues associated with the aforementioned emission control devices. Historically, individuals and workshops have implemented these changes in response to perceived limitations in factory performance or as a cost-saving measure compared to repairing or replacing malfunctioning original equipment.