Why Are New Cars' Exhaust Pipes Often Stained Black?

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Why do so many new cars try to hide the exhaust pipes or make them seem like they are a part of the body of the car especially larger cars? Do people

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Black staining from exhaust. : r/Justrolledintotheshop

Why Are New Cars' Exhaust Pipes Often Stained Black?

Exhaust Smoke Part 2: Black