I'm in the same boat and leaning towards getting cats for same reasons. I was actually told by a reputable tuner, that cats on high horsepower cars or cars that he's tuned, have actually "broken up." I'm guessing due to high temperatures, or whatever other reason he justified that with. This doesn't seem like something that should happen, and I don't really see How that claim even is logical. Has anyone else ever experienced something like this?