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Back in the early days of Cat converters the smell was considered to be some sort of byproduct of a malfunctioning Cat caused by cheap adulterated fuel. Most cats in the era didn't smell, and there were a couple companies selling an additive perfume just in case.
I don't remember how the issue was resolved because all my vehicles were generally over 20 years old and cat-less.
My new stuff doesn't stink other than the diesel smell.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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