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you are mostly just being paranoid. upon startup, after your car has had a chance to cool off over night, you may notice a thin white billowy cloud coming from exhaust. the exhaust cooled off over night condensing the air in the exhaust pipes and which settled along the bottom of the pipes. this is why we dont mount o2 sensors on the bottom of exhaust pipes. when you start the car, the hot exhaust warms the settled water, evaporates it, and carries the vapor out with the rest of the exhaust. this is magnified by the size of your exhaust: more volume to condense more air.
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