DPF stands for diesel particulate filter. A DPF delete kit is a combination of parts that allows you to remove the DPF without diagnostic trouble codes being set and/or a check engine light. The most basic DPF delete kit consists of a DPF delete pipe that takes the place of the factory particulate filter and DPF delete capable tuner. Depending on the vehicle make/model/year several companies make DPF delete tuners to work. To name a few: H&S Mini Maxx, RaceME Ultra, EFI Live, EZ Lynk, SCT & Patriot.