My 95 Max GLE has original exhaust system at 147,000 miles. The muffler is very rusted on the outside and needs to be replaced soon. When the car is started cold (summer) I hear a raspy rattling sound that goes away in a couple of minutes after things warm up. I'm guessing that the noise is exhaust system related. Heat shields? or something? What parts of the exhaust system tend to fail first?
I plan to keep car for a long time, should I replace the entire exhaust system or just the muffler. Should I use Nissan parts or go after market?