Removing this Cummins ISX device's emissions controls commonly called an "ISX delete" is the increasingly common modification for heavy-duty trucks, although it’s very important to understand any https://docs.google.com/forms/d/e/1FAIpQLSdspTJGjB4yyIADRybb0YyNWTc_87geTql01KwiqZgtJ2pPpw/viewform?usp=publish-editor