Removing the Cummins ISX engine's emissions hardware commonly called an "ISX delete" is the increasingly common modification for heavy-duty trucks, although it’s essential to understand all implications. https://docs.google.com/forms/d/e/1FAIpQLSe7mVDYbW0hhxVkeEbHREjuxpEBueegcIAbYotOPcUf8lVeFw/viewform?usp=publish-editor