Hello everyone.

I’ve been researching performance upgrades and keep coming across delete kits for diesel and some performance cars. From what I understand, these kits remove or bypass emissions systems like the EGR, DPF, or SCR/AdBlue components, but I’m not fully clear on what is actually included in a typical delete kit.

I want to understand what changes are made to the engine system and whether there are real benefits in performance, fuel economy, or reliability. On the other hand, I’ve also heard there can be legal issues, warning lights, or long-term engine risks.

Can anyone explain how these kits work and share real-world experiences or advice before considering anything like this?