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 critical to understand all implications. https://directoryunit.com/listings13749597/cummins-isx-delete-solutions-everything-you-need-to-know-to-cummins-isx-kit-options-key-factors-and-emissions-regulations-for-fleet-managers