Removing the Cummins ISX system's emissions controls commonly called an "ISX delete" is a kind of increasingly popular modification for heavy-duty trucks, although it’s very important to understand any https://docs.google.com/forms/d/e/1FAIpQLScp5Ww4wOTB5pu4M9Ed1xbDue3po8Z-ueS18Z1cX-ekPvr4cw/viewform?usp=publish-editor