Removing this Cummins ISX engine's emissions controls commonly called an "ISX delete" is a kind of increasingly popular modification for commercial trucks, but it’s very important to understand the https://docs.google.com/document/d/1Pg3pTEB3SHVFcByXJ4pDvoy2jIMW-j7t1H-z5OZmBWQ/edit?usp=sharing