If you live in the United States, removing your truck's emissions components is not legal for road use. You may be subject to a fine if caught.  If you live in a country where these rules don't exist, then you're fine. But in the US, these components are for closed course race applications only. In addition, make sure you do NOT delete any physical components (such as the DPF and EGR) without also installing the delete tune. Your truck will either fall into limp mode if it's newer, or you can damage your truck. If you make any hardware changes, you need to make software changes as well.