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Do catalytic converters have an adverse affect on gas mileage or engine lifespan?

They create back pressure in the exhaust, which takes power (and corresponding amount of fuel) to overcome. Other than that, no adverse effects I'm aware of.
Ben.T's user avatar
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Do catalytic converters have an adverse affect on gas mileage or engine lifespan?

The chemical reactions in the exhaust system are caused by specific byproducts interacting with the catalyst embedded in the converter. A catalyst is a compound or a component which causes or assists ...
fred_dot_u's user avatar
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