First, we don't condone removing emissions systems on a road-going vehicle and is illegal in certain countries.If you are exempt from these laws and want to get rid of these systems that came on the vehicle from the factory, you will need need to remove the DPF/DEF filters from the exhaust system and recalibrate the PCM using a delete-capable tuner.  The EGR system will be disabled by this recalibration and all the DPF/DEF/EGR error codes that would trigger a check engine light will also be disabled by this calibration.  The DPF/DEF system will need to be physically removed from the vehicle but the EGR system is optional.  The EGR system uses a heat exchanger to exchange the heat from the hot exhaust gases into the engines cooling system by running the engine coolant through a radiator-like device but instead of regular air passing through it to cool the coolant, it has hot exhaust gases flowing through it to cool them down before they reenter the combustion chamber.  These systems can wear out causing them to crack and leak engine coolant into the combustion chamber which can cause anything from poor running conditions to a blown engine. To summarize, you need:DPF delete pipe, or a DPF delete exhaustA delete-capable tunerIt would also be wise to add an EGR delete kit