The phrase refers to a set of guidelines or a manual detailing the process of removing or bypassing the Exhaust Gas Recirculation (EGR) system on a vehicle equipped with a 6.4-liter engine. These instructions typically outline the tools required, the steps involved in physically disconnecting the EGR system components, and any necessary modifications to the vehicle’s electronic control unit (ECU) to prevent error codes or performance issues.
Modifying or removing emission control systems is often undertaken to potentially improve engine performance, fuel economy, or reliability. However, such alterations can have significant environmental and legal implications, as they might violate emissions regulations in certain jurisdictions. Historically, EGR systems were introduced to reduce nitrogen oxide (NOx) emissions, a significant contributor to air pollution. Therefore, circumventing this system can increase NOx output.