I am hoping someone can tell me why my exhaust keeps blowing through my donut gaskets. The y- pipe keeps coming loose and i keep tightening it, and exhaust blows a hole in the donut gaskets. I've replaced them a couple of times. Could this be caused by a bad cat?
i am also wondering if a custom y-pipe would be worth it. i have a 2.8 v6 camaro. i was quoted $325 for a custom y-pipe and bigger pipes going all the way back. does this sound right? thanks.

Chris