Originally Posted by jovoke

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, similar to what people report with a cummins delete kit. 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?