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Modern internal combustion emission's

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I noticed newer gas and diesel cars seem to burn perceptively clean at normal loads. But anytime someone is feeling playful and gives full throttle in front of me, I get a strong whiff of sulfur or gunpowder type smell. And this is in brand new cars

It's got me asking, exactly how much worse are emissions under a full load scenario vs cruising? And does emissions test under full throttle scenario?