When i bought the car, it seemed noiser that I remember a stock 325is being,
clearly audible from inside the car with the windows rolled up, esp starting out from a stop.
The stock cat was replaced last month in an effort to get the car smogged(it eventually passed smog, barely) . after replacing the cat the exhaust system was still noisy.
I put my ear near the muffler and it sounded like noise was coming from that area, sooo I bought a new ansa muffler and had that installed today.
guess what... its even louder!
The muffler guy said that whoever installed the cat converter used an aftermarket one and its smaller than the original OEM cat, so he thinks the noise is not being dampened by the cat.
I asked him about a resonator and he said that my car didnt use a resonator and that the noise control came from a combination of the cat and the muffler.
has anyone else had this problem? do I have to use a stock muffler and cat to get the car 'as new' quiet?
I thought that mufflers made things quiet -- has anyone else heard of a cat being used to quiet an exhaust system?
anyhow thanks for the help!