John,Welcome to the forum.
They are pretty darn quiet stock. Do you have a non-standard exhaust?
Yes, proably just the muffler, but the catalytic converter could also have been removed or "gutted".John,
Well not sure. Just bought it. Third owner. The lady we got it from did nothing to it for sure. Maybe the 1st owner. Just too " ricey" for us. It would be the mufflers only?