So, i don't got emission tests here in Saskatchewan, and one of my catalytic converters is plugged, and the other knocks terribly. So, it's time to cut them off. There's no doubt in my mind that i'm going to do it, i just need to know exactly what to do to stop the engine light(other then a custom tune). My buddies said that getting O2 Simulators would fix the problem. But i don't know much about this subject. So if anyone could enlighten me on what to do, it would be much appreciated. Also, if i were to just cut off my catalytic converters and just weld in a pipe myself, knowing that the engine light was on, will it cause any damage to my truck? Because i can't take the knocking anymore, and one tail pipe pushing out tonnes more exhaust then the other. Thanks!