I had a new muffler installed on my 2001 Regal because it sounded loud. I also had a catalytic converter replaced by the dealer because the car was missing when I accelerated. The converter took care of the missing or poor power. I also had the whole muffler system replaced. I also put new tires on the rear because I thought that might be the problem.
I am still getting a loud sound out of my muffler. Could a new muffler from Muffler Man go bad within a month? The faster I go the louder the sound. I have a hard time hearing the radio when I go past 50 miles per hour.
Could the catalytic converter be bad? I have run out reasons of the sound out of the new muffler.