Considering a removal of your Cummins ISX engine's exhaust system? A “delete,” typically referring to the deletion of Diesel Particulate Filters (DPFs) and Selective Catalytic Reduction (SCR) equipment , https://succulent-lantana-fd5.notion.site/Essential-Diesel-Engine-Maintenance-Practices-for-Better-Performance-and-Reliability-40ec39dc621a80f39036c21302ba71a4