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