Catalytic converter to help exhaust fume smell

Well, this project has yet to be even fired up for the first time, so its still deep into the yet-to-be-tuned stage. i just know that from my other projects, the smell of raw exhaust is not really appreciated by most people born from the 80's on up. I myself don't mind the smell, as i was practically raised on it, however i don't want it to be "just another old, stinky car." I had thought about the dreaded rotten egg smell, but i would think that as long as the carb is running like it should, then the cat shouldn't make much of a smell at all, right?