A friend, who is a diesel mechanic, just went through the diesel emissions timeline with me very recently.
EGR valves -> DPFs -> DEF
I understand the necessity of these systems, but it seems like they are incredible fragile (the DPFs on VWs are prone to cracking and new ones are more than the average cat). I also understand why people do DPF deletes...
EGR and DPF on diesels are just trash and will be for the foreseeable future barring some yet unknown development in materials science. DEF, while another obnoxious consumable is pretty problem free by comparison
