Considering a bypass of your Cummins Signature engine's pollution control system? A “delete,” typically referring to the deletion of Diesel Particulate Filters (DPFs) and Selective Catalytic Reduction (SCR) https://www.tumblr.com/paccarpx7deletekitt/832419478125133824/common-dpf-and-egr-problems-in-commercial-diesel?source=share