Originally Posted by 98CoupeV6
Sounds more like a loose heat shield. If your cat is bad you'd get awful nitrous oxide smell inside the car when accelerating up hills. I know because mine went bad at 150k and I didnt change it until 210k
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No it wasnt the heat shield because i removed the whole shield and it still rattled. then my exhaust got ripped off(it was a greddy evo that was 4 years old) i unbolted it and check the inside of the cat and the honeycomb material was completely loose.
it would only smell inside the car if the car had a whole in it otherwise it would just smell like sulfur from the rear and it would blw black smoke once in a while.
the funny thing is that mine doesnt smell and doesnt blow black smoke. and like i said that my cel hasnt come on in 40k.