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Look at an American car from 1971, then find the same model from 1974. The earlier car may have a slim chrome blade tucked neatly against its body. Three years later, the bumper appears to have lef

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Gasoline particulate filters, also called Otto or petrol particulate filters, are showing up in more modern cars to cut down on particulate emissions. Started in Europe and China back in 2017 and 2020