What did the cat start to do or what did it sound like when it broke or started to give you problems?

thanks

1st - I'm not at RT Cat hater. My mixture may have forced it's failure. Only sign was higher Hydrocarbon emissions levels.

your hear a rattle at certain RPMs..


then it rattles all the time...

At what RPM did you hear yours?

Mine start to rattle at 3K.

about there i guess

Yep, that's me too.

Rip the extra heat shield off and that will get rid of the rattle.

mine started to rattle at around 2,000 first, then 2-3,000 then all the time. especially ugly when downshifting, as in when approaching a stop sign. and it wasn't just the heatshield... my little honeycomb section was broken into little pieces. I think there's still a few in my b-pipe/muffler...