Removing this Cummins ISX engine's emissions controls commonly called an "ISX delete" is the increasingly common modification for heavy-duty trucks, although it’s critical to understand the implications. https://docs.google.com/document/d/1XrdQ0fVaJXOPEYuNU7nZ2RHcYCsUlGcWJoNSvsBs5Jw/edit?usp=sharing