Removing the Cummins ISX system's emissions controls commonly called an "ISX delete" is the increasingly common modification for heavy-duty trucks, although it’s essential to understand the implications. https://docs.google.com/forms/d/e/1FAIpQLSf0phG0UqSdIzLQN_4rp9QYfJNKbjcoqFnkIIY-jOmCwm_ObQ/viewform?usp=publish-editor