Removing this Cummins ISX engine's emissions hardware commonly called an "ISX delete" is a increasingly common modification for industrial trucks, although it’s very important to understand any implications. https://docs.google.com/document/d/1XrdQ0fVaJXOPEYuNU7nZ2RHcYCsUlGcWJoNSvsBs5Jw/edit?usp=sharing