I have had my carsound cat for about 5 months now and it has broken somehow. The catalyst material inside has become loose and rattles. Not to mention, the O2 bung on the cat is positioned so that the o2 sensor is dangerously close to the ground. If you bottom out, bye bye oxygen sensor. So now i have a punched out hi flow cat so that i can be relieved of the noise. I need to get a new one now. Moral of the story DO NOT BUY CARSOUND hi flow cats. Just my $.02

 

RT cats suck worse. My 3-gen one blew out the brick long ago. I modified a Carsound unit for a 4-gen to work for my 3-gen and it's been fine.

 

Welcome to the AFTERMARKET CATS SUCK CLUB(ACSC). I bought my car with a car sound and the honey comb inside has become loose and rattles around. I think it's because the car is running rich. I have a solution for it, very simple, but cutting up the cat and welding is involved.

 

Doesn't sound very simple to me.

I've got the RT brick myself, seems fine but I probably don't know any better.