I have a 1985 Z-28 5.0L TPI. I was wondering if the catalytic
converter contributes any significant exhaust noise reduction. I
recently replaced both the original catalytic converter and the
muffler on my car. I noticed that the exhaust noise is noticeably
louder now and has a different pitch to it too. Since I have replaced
the muffler several times before from the same service center without
the noise change I suspect the catalytic converter as the culprit.
The original catalytic converter was larger with two chambers. The
new converter has only one small chamber so I'm thinking this must be
why the exhaust noise is so much louder. Does this mean the
replacement muffler should have been "matched" to the newer catalytic
converter to get the proper noise reduction?