Hey Leo. Sorry about your exhaust. If I was in your position, I personally would look into getting a totally stainless steel exhaust system from either an aftermarket dealer or a local installer. If you want to be as quiet as possible, I would recommend getting like a large sized Borla, Dynomax or Magnaflow muffler in stainless and then also have a resonator installed. Get a large cased muffler. I recommend stainless because you live in Canada and hopefully the muffler will last longer due to condensation from the moisture in the exhaust, which is probably the main cause of your current situation. I just wonder if your dealer actually replaced your first system with a GM OEM exhaust or they out sourced an “OEM looking” exhaust from a cheaper manufacturer. Just my two cents. Hope you find a solution.