- Location
- MilkyWay Galaxy
Very fast if the cat sees too much fuel from a rich operation. It super heats them and breaks the honeycomb into pieces that flop around and block the exhaust, or melts the face blocking exhaust. Or road hazard damage? Otherwise in normal healthy use way over 100,000 miles
How fast can a cat go bad? The entire exhaust from the down pipe back is a year and half old give or take.