Nah. H2S.
H2S is "rotten egg gas", which is what is associated with no cat.
SO2 is equally nasty, and if you've ever smelt it you'll know all about it. More of a choking, acid in the back of the throat sort of thing. But you can only smell it in a narrow range up to about 1ppm. Above that, it irritates your mucous membranes, but you don't smell it.
Stock ECU has compensation, you won't damage the engine. Personally I recommend getting an acceptable catalytic converter, it doesn't need to be OEM and super expensive but a cheap universal one to keep it from being super obnoxious to be around. Decatted cars smell pretty awful.
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