I have a '71 coupe that used to be a bit loud. I took it to a muffler shop and was told that whoever had done the last exhaust pipe had put "the wrong muffler & resonator" on there. The car now sounds the way an Imperial should. So maybe the wrong set-up is on there?? MM Oneof514@xxxxxxx wrote: > I have a 71 Imperial with single exhaust and a resonator. > > With 110,000 miles on the car, it is obviously not the orginial muffler. > > I wish the car were quieter. My mechanic had a 67 coupe that I thought was > much quieter than my car. > > I was told that the newer car mufflers are not as quiet as the older mufflers > - since newer mufflers were designed to be used with a catalytic converter - > and the catalytic converter deadens some of the sound. When you use one of > these mufflers on a car with no catalytic converter, it is louder. >